An incredibly simple game that will knock you out of your chair. Basic supplies: beer and people (as usual), plus a big pot, or pitcher.
All players sit in a circle. Each player contributes one beer to the pot. One player starts drinking from the pot. This person can drink as much or little as s/he chooses. When done, the pot passes to the next player who does the same thing. The person who empties the pot is the winner. The person who drink immediately before the winner is the loser.
The loser must then put a beer in the pot for each of the players; then play starts again. Or a variation is that the loser puts in two beers, the winner zero, and everybody else puts in one.
This is also a great game to be played in bars. Buy a big pitcher of beer. Pass it around. The loser buys the next pitcher.
It is important that the pot/pitcher is big - it makes it harder to judge the amount of beer remaining.
Also known as: Boot-a-Bout
This one's a classic, and will get you very pissed. Don't play with anyone who has a few diseases though. The other downside is you really need to be able to blow a bit of cash, so it might not be the best student game.
You start off sitting in a circle with a jug (as big a jug as possible; a number of Wellington pubs, e.g. BackBencher, Molly Malone's have 2.8 litre pitchers, which are perfect).
You drink as much as you like from the jug, then pass it to the next person. They drink and pass it on.
When someone finishes the pitcher, whoever gave it to them buys the next one. Simple, eh? People will do anything to get out of buying beer. The game normally starts off with small sips, but it eventually gets to the level when someone decides they can "go for it", and attempts to scull the lot. The prick about this is once you start, you can't really stop, or you'll pass on a pitcher with a few mouthfuls left after sculling a litre or so yourself...
Playing this with 1-litre jugs is OK after a few rounds; initially, it's fairly easy to scull a jug, but it quickly starts to get harder.