1/2 oz of Kahlua coffee liqueur (or coffee liqueur)
1/2 oz of Bailey's Irish Cream (or Irish Cream)
1 tsp of Bacardi 151 rum (or overproof rum)
Use a spoon to layer the alcohol and float 151 on the top. Lite on fire, let it burn for about 5 seconds, then blow it out and suck it up through a straw.