I suggest Flaming Dr. Peppers..
Requires:
1 Pint Glass ( i use a "borrowed" A&W Rootbeer mug)
1 Shot Glass
Liquids:

Bacardi 151
Amaretto
Beer (Have done it with multiple beers, liked Green Light the best tho.)
Directions:
Fill shot 3/4 with Amaretto
Fill shot 1/4 with 151.
Do NOT mix shot.
DON'T TOP OFF THE GLASS!!!
Fill mug with chosen beer, 3/4 of the way full.
Light shot, allow to burn for a few seconds..
Drop shot, drink quickly.. enjoy the aftertaste of Dr. Pepper.
*Disclaimer*
You could burn the **** out of your face... my friend burned his cheek.
Do not do 2 of these in a row then proceed to drink between u and a buddy 5 large pitchers of beer.