This is a drinking game my friends and I played at Schoolies called 'band'. If you don't know how it's played, here are the basic rules.

Everyone is given an instrument, eg. trumpet, guitar. Everyone starts off by getting the rythym going, which is slapping your legs twice and then clapping twice. One person will begin the round by doing the action of their instrument in place of the claps, followed by someone elses instrument, eg. trumpet person does their action, then does a guitar action. The person who was guitar then has to do their action on the next beat, followed by someone elses, etc, etc. Basically you pass it back and forth between the players until someone fucks it up.

Hard to explain. Easy to play. Everyone gets drunk and has fun. Watch the video and you'll get the hang of it.

p.s. we made jelly with heaps of vodka in it, so if you lost you had to have a huge spoonful. It tasted dreadful.