Think Groucho and comedy, not Karl and communism. Along with his brothers Chico, Harpo, and Zeppo, Groucho Marx starred in the 1932 comedy film "Horse Feathers" (horsefeathers is old American slang, sort of a polite version of the word that rhymes with "wool mitt"), one of their many comedic cinematic ventures. Benny Roff included the Horsefeathers in his book Prohibition Cocktails, and I learned about it from My Dad Made a Cocktail on Instagram.

1 ounce cognac or brandy
1 ounce aged rum
.5 ounces Benedictine DOM
.5 ounces maraschino liqueur

Combine in a mixing glass with ice, stir with some Marx Brothers madcap hilarity, and strain into a chilled glass. Orange peel garnish optional.

The Horsefeathers is sort of sweet, which isn't surprising considering it includes rum (a sugar cane based spirit) and two liqueurs. You see the Benedictine DOM in drinks such as the Monte Carlo, and maraschino liqueur in drinks such as the Last Word, which predates the Marx Brothers movies by more than a decade. The cognac kicks in at just the right moment. Don't let the sweetness of the Horsefeathers fool you, because every spirit in it is strong. If you want a drier Horsefeathers, try adding .5 ounces of cognac and subtracting .5 ounces of rum. Go with aged rum here because it has more liquid gravitas.

The Horsefeathers is a solid and delicious drink. No horsefeathers.

The Boulevardier was an English language literary magazine in Paris in the 1920s. Erskine Gwynne, the editor, was a loyal customer of Harry McElhone, who founded the eponymous Harry's New York Bar. Even though it's not clear if Gwynne or McElhone created the Boulevardier, McElhone mentioned it in a footnote in his 1927 book Barflies and Cocktails.

1 ounce bourbon
1 ounce sweet vermouth
1 ounce Campari

Combine in a mixing glass with ice, stir with some American je ne sais quoi, and strain into a chilled glass. Lemon or orange peel garnish optional.

Fundamentally a Boulevardier is a Negroni with bourbon instead of gin. Another way of viewing it is that it's a modified Manhattan with Campari instead of Angostura bitters. Like other cocktails such as the Old Pal (which McElhone created for another one of his loyal customers), the Bijou, and the Last Word, the Boulevardier is a bartender’s dream because of its simple ratio and short ingredient list. If you want to emphasize the bourbon, a variation I like uses one and half ounces of bourbon and .75 ounces each of the sweet vermouth and Campari. The Boulevardier lends itself to tinkering. For example, add some molé bitters, and you have a Left Hand.

Looking for a simple and laudable cocktail? Have a Boulevardier and look no further.

Ron, my father-in-law, recently commissioned an original cocktail creation for his 80th birthday (four score is old way of saying 80; think of the beginning of Abraham Lincoln's Gettysburg Address). His request? A drink that is scotch based, dry, and nutty. So I brought forth upon this world, a new cocktail, conceived in the Wulf Cocktail Den, and dedicated to the proposition that all drinkers are created equal (see below for the non-alcoholic version).

2 ounces scotch
.5 ounces dry vermouth
.25 ounces amaretto
2 dashes hazelnut bitters

Combine in a mixing glass with ice, stir with some matter of fact festiveness like the drink's namesake, and strain into a chilled glass, preferably rocks. Amarena cherry garnish optional.

The Ron's Four Score takes its place in my pantheon of commissioned cocktails such as the Cancer Killer #1, the Ray's 619, and my personal favorite, the Whiskey Queen. As Ron requested, this cocktail is pretty dry. If it's too dry for you, add a quarter ounce of amaretto or serve it on the rocks. The amaretto and the hazelnut bitters give the Ron's Four Score a hint of nuttiness. If you can't find hazelnut bitters, use chocolate or Angostura, but then of course the drink will taste a little different. Using ingredients Ms. Cocktail Den found online, I also created a non-alcoholic (what I call a 3/4 cocktail) version with Spiritless Kentucky 74, Roots Aperitif Bianco, and Lyre's Amaretti (use the same proportions as the alcoholic version).

You don't have to be named Ron, be 80, or be celebrating a birthday before you can have a Ron's Four Score. What do you need to have? Some spirit (pun intended)!

Pan American World Airways was one of the major players in commercial aviation, and its Clipper flying boats were known around the world. In 1939 Charles Baker mentioned the cocktail in his book The Gentleman’s Companion, or Around the World with Jigger, Beaker and Flask. Unlike the Clippers (which stopped being used shortly after World War II) and Pan Am (which went out of business in 1991), the Pan Am Clipper continues to soar thanks to articles such as this one in Punch. Here's my adaptation:

2 ounces apple brandy
.75 ounces lime juice
.75 ounces glorious grenadine
Absinthe

Coat the inside of a chilled coupe glass with absinthe, discard the excess, put the other ingredients in a shaker with ice, shake as if you're hitting some turbulence on the way to a fascinating new destination, and strain into the glass.

Fundamentally the Pan Am Clipper is a Jack Rose with a little absinthe. Absinthe presents one of the many variables in the Pan Am Clipper, as you can either coat the inside of a glass (as you would with a Sazerac) or put a very small amount directly in the mix (as you would with a When Ernest Met Mary). Similarly, you could use applejack instead of apple brandy; if you compare apples to apples you'll know they are similar but not the same. Regardless of your attack angle (pilots know what I'm talking about), the Pan Am Clipper belongs on the aviation cocktail itinerary along with drinks such as the Paper Plane, the Burnt Fuselage, and of course, the Aviation.

So are you ready to take cocktail flight on the Pan Am Clipper?

Greenpoint is a neighborhood in Brooklyn. In 2006 Michael McIlroy created the Greenpoint, a variation on the Brooklyn.  I wasn't in Greenpoint when I was introduced to its namesake cocktail. That happened in the Lower East Side in Manhattan, specifically at Attaboy, where McIlroy and Sam Ross (who created the Paper Plane and the Penicillin) operate.

2 ounces rye
.5 ounces yellow Chartreuse
.5 ounces sweet vermouth
1 dash Angostura bitters
1 dash orange bitters

Combine in a mixing glass with ice, stir with a bit of Brooklyn hustle, and strain into a chilled glass. Lemon peel garnish optional.

Spirits and bitters converge to make the Greenpoint a balanced and spirit forward cocktail. The rye stiffens the drink's spine. To me the Chartreuse is the key element separating the Greenpoint from other variations on the Manhattan or the Brooklyn. Joining rye and yellow Chartreuse works well here, just as it does in the Diamondback. If combining rye and green Chartreuse intrigues you (it should if you like strong drinks), try the Final Rye or the Purgatory.

To paraphrase the Beastie Boys song, no sleep 'til Greenpoint!

Does the name make you think of Dr. Frankenstein (or if you're a fan of Mel Brooks, "Frankensteen")? Corpse Revivers were a group of cocktails dating back to the late 19th century. Their purpose was to reinvigorate you (revive your corpse) the morning after a night of drinking. In 1930 Harry Craddock included the Corpse Reviver #2 in The Savoy Cocktail Book.

.75 ounces gin
.75 ounces Lillet Blanc
.75 ounces triple sec (I suggest Cointreau)
.75 ounces lemon juice (1/2 lemon)
Absinthe

Coat the inside of a chilled glass with absinthe, combine the other ingredients in a shaker with ice, shake with the jolt of a renewed lease on life, and strain into the chilled glass. Lemon twist garnish optional.

Bearing no resemblance to the Corpse Reviver #1, the Corpse Reviver #2 is the best known survivor of the group. Its four equal parts format makes it like the Last Word, which also includes gin. Just as it does in the Vesper, the Lillet Blanc, a French aperitif wine, melds nicely with the gin. Using a clear triple sec such as Cointreau will give the Corpse Reviver #2 a light, refreshing look to match how it tastes. Some versions of the Corpse Reviver #2 call for putting a small amount of absinthe directly into the cocktail (as you would with an When Ernest Met Mary) instead of using it to rinse the glass (as you would with a Sazerac). Do what you prefer.

As Craddock remarked, "Four of these taken in swift succession will un-revive the corpse again." Now you know about the Corpse Reviver #2's deceptive power, have fun reviving!

Coming up with a brilliant idea is the purpose of a brainstorm. First appearing in 1930 in Harry Craddock's The Savoy Cocktail Book (the source of other drinks such as the Champs Élysées), the Brainstorm is the liquid realization of a brilliant cocktail idea. I discovered it in Difford's Guide.

2 ounces Irish whiskey
.5 ounces Benedictine DOM
.5 ounces dry vermouth

Combine in a mixing glass with ice, stir as you contemplate something mind blowing, and strain into a chilled glass, preferably a coupe. Orange peel garnish optional.

Interestingly, Craddock specifically called for Irish whiskey in the Brainstorm, but other whiskey based cocktails in his book are silent about the whiskey's provenance. I'm certainly not complaining. I love Irish whiskey on its own, or in a drink such as a Tipperary or a Good Cork. The Benedictine DOM, a key part of cocktails such as the Honeymoon, adds a bit of sweetness to the equation, and the dry vermouth keeps the Brainstorm from being too sweet. Whiskey and dry vermouth make a nice combination in the Algonquin and the Scofflaw, and it's the same here.

To quote a line from Madonna's song Vogue, strike a pose (imagine Rodin's The Thinker) as you sip the Brainstorm. So what's your brilliant idea?

Do you have a friend you've known for much of your life? Many people do. If you're one of them, it's unlikely your friend is as old as the Old Pal. Dating to the 1920s, the Old Pal is the brainchild of Harry McElhone, the proprietor of Harry's New York Bar in Paris. Reputedly he named it for William "Sparrow" Robinson, the New York Herald's sports editor in Paris.

1 ounce rye
1 ounce Campari
1 ounce dry vermouth

Combine in a mixing glass with ice, stir with the familiarity of an inside joke you share with a you know who, and strain into a chilled glass. Lemon peel garnish optional.

The Old Pal's three ingredient equal proportion formula is a bartender's dream. The same goes for other drinks such as the Bijou, the Luck of the Irish, Corpse Reviver #1, and of course, the Negroni. The Old Pal really is close cocktail kin of the Boulevardier, which McElhone made famous. It simply swaps in rye for bourbon, and dry vermouth for sweet vermouth. No surprise the Old Pal has a spicier, drier taste than its cousin. Depending on the preferences of you or your guest, you can tweak the traditional 1:1:1 ratio of the ingredients.

Old can be great. It's true with an Old Fashioned. It's true with Old Tom style gin. So say hello to your new cocktail companion, the Old Pal.

Claude Monet painted the famous Water Lilies series at his garden in Giverny, France. I've never been there (Ms. Cocktail Den has), but she and I have had the good fortune to see some Water Lilies paintings in places such as the Musée de L'Orangerie and the Musée Marmottan Monet in Paris. Richie Boccato created the Water Lily cocktail in New York in 2007.

.75 ounces gin
.75 ounces triple sec
.75 ounces crème de violette
.75 ounces lemon juice (1/2 lemon)

Combine in a shaker with ice, shake with a tempo evoking the placidly vivid colors of the paintings, and strain into a chilled glass.

Think of the Water Lily as combining the DNA of the Aviation with the format of the Last Word. The crème de violette gives the Water Lily its purplish hue. Keep in mind the purple color won't be as vibrant if you use a darker triple sec. Like other cocktails such as the Bijou or the Naked and Famous, the Water Lily is a bartender's dream because of its equal proportions.

Even though this Water Lily won't last nearly as long as Monet's, it gives you the opportunity to become a cocktail artist.

Triple sec. Grand Marnier. The three Cs (curacao, Cointreau, Combier). Whether it's a popular drink such as the Margarita, an underrated oldie such as the Burnt Fuselage, or an original such as my Cancer Killer #1, a lot of recipes call for one of these orange liqueurs. So what are the differences? And why should you care? This article from Tim McKirdy distills (pardon the pun) this liqueur category into some key facts.

So back to the second question ... why should you care? Because the liqueur you use will affect your cocktail. For example, an orange and cognac or brandy hybrid such as Grand Marnier or Gran Gala has a thicker, richer taste. That makes it great for a whiskey based drink such as a Dubliner, but not so much for a vodka based drink such as a Cosmopolitan. Of course, it all depends what you prefer, and what you have in your liquor cabinet.

In the past we compared apples to apples. Now that we've compared oranges to oranges, you'll use your new knowledge to make which cocktail?