1 1/2 oz Vodka (Absolut)
1 splash Lime juice
1 splash Grenadine
Float 1/2 oz Bacardi 151 proof rum
Pour Vodka, lime juice, and grenadine into shot glass. Then layer 151 on top from the back of a spoon. Light the 151 and shoot it while lit if you dare. If you are worried about shooting a lit drink, just blow out the flame and then shoot the drink.
Be aware NOT to let the 151 burn too long or you will burn your lips on the shot glass. Embarassingly enough, I know this from personal experience.