1 oz Amaretto
1/2 oz 151 Rum (any brand, but MUST be 151 proof...or higher)
12 oz Beer (I prefer Shiner for the color...and it's the best beer in the world, too)
OK, here we go. Pour the Amaretto into a shot glass; it should be ~2/3 full. Slowly pour the rum on top (I use a cherry or spoon to make this easier). DRUM ROLL PLEASE! Light the rum on fire. WOO-HOO!
Drop the lit shot (glass & all) into a glass full of beer.
And hey, let's be careful out there!