This is about rum, not the mantra of old school coaches and gym teachers. The Painkiller originated in the British Virgin Islands, a beautiful area my wife and I recently visited, in the 1970s. Pusser's Rum later trademarked it (yes, companies can do this). A few years ago Pusser's even sued a New York City bar named Painkiller that used a different rum in the drink (Pusser's won but caught a lot of flak). Put aside the Painkiller's occasionally contentious history and savor my version of it.
Combine in a shaker with ice, shake with the joy of making all of your pain go away, and strain into a ice filled glass. Garnish with nutmeg (grated or powder).
Most recipes for the Painkiller call for more pineapple juice. However, I prefer drinks in the Den to be more "alcohol forward." Similarly, the original Painkiller uses cream of coconut, but I use coconut milk because I prefer the taste. The nutmeg garnish definitely enhances the drink. If you let a Painkiller sit it will become watered down, so consider being a contrarian and serving it neat in a chilled glass.
True to its name, the Painkiller is wonderfully effective and evokes memories of beautiful beaches. If you want a tropical drink without a tropical vibe, just play House of Pain (either the 1990 song by Faster Pussycat, or the hip hop band that sang "Jump Around" in 1992). Either way your pain will rest in peace.