This is a fun relay race style of game in which you need at least 4 to 5 people a side to make it fun. (In my blurry observation anyways)
The object is to drink the beer down then flip your cup to where it is sitting upside down from where it started before your opposition. First team to complete this task wins.
All you need to play this game is 8-10 people, 8-10 plastic keg cups and some beer. Fill the cups halfway full with beer and let the flipping and intoxication begin!
Here is an example this was a fun night with some buddies!