Everybody chooses beetwen the rock, the paper or the scissors. They all show at the same time. The rock beats the scissors, the scissors beats the paper and the paper beats the rock. Everytime someone beats you. You drink.
For example: Pierre, Jean, Marc, Paul, Fred and Roberto Poitras are playing together. Pierre, Jean, Marc and Paul have choose the rock, Fred the paper and Roberto Poitras the scissors. Pierre, Jean, Marc and Paul will drink one time each (only one paper), Fred will drink one time (only one scissors) but Roberto Poitras will drink 4 times (4 rocks) and they start again and again until the beer kills them all.