A superb game that you will just need a coin and die and a glass (oh and plenty of beer of course).
How to Play
Place the coin and die in the glass. The player then shakes them up and places the glass face down in front of the player to his left. Without looking that player must guess whether the coin is heads or tails. If he is right he shakes the glass for the player on his left, if he is wrong he takes as many drinks as there are dots showing on the die.
(If you are feeling very brave, just use two dice and drink the combined number of dots!)