This is best done in a pub, where everyone has a drink or can get one quickly. One person starts with the peg and has to attach it to another member of the party without them noticing. At regular intervals (about every 10-15 minutes) someone has to shout "Who's got the peg?" Whoever has it stuck to them has to down their drink in one. If you get caught trying to attach the peg, you have to down your drink.