|Simple variation of Volleyball Quarters.
Two teams (2 per team works well) stand on opposite sides of a small table with five cups in a row in the middle. The four cups on the sides are the same size and the one in the middle is larger (Solo Cup size is usually about right). Something like this...
A player on a team gets one chance to bounce a quarter into one of the smaller cups to their right of the big cup. As soon as a cup is hit the other team has to chug it. Once both players on a team have tried, it's the other team's turn.
After hitting your two side cups you try for the center. The other team has to drink the big cup as well as whatever they hadn't hit on their side.
Folks can get trashed if they're not good at quarters, or (worse) if you put something other than beer in the side cups. This game gets better as the night wears on. Enjoy.