This game is quite simple and the amount one drinks is dependent upon how much they can chug.
The basic rule of the game is you listen to the beer song by reel big fish. Everone gets in a circle first off. Every time they say "I think I'll have another beer" you continue to drink until they start singing again note this happens three times and it may seem short if you just listen, but when your drinking...it gets long.
A twist to the rules is you do not stop drinking after the last time it is said, instead you drink until you're either out of beer or the song ends.
It is been known to easily drink two beers within three minutes and once you get to know the words it's great to sing along. Great for warming up a party.