A game

The girls in the teenage class introduced me to a new game. The game is called 'Penis'. The aim of the game is to say the word 'penis' more loudly (louder?) than the last person who said it. Essentially it's a room full of people screaming 'penis' at the top of their lungs.
They started this game during rehearsals for the end of year play. I asked them to stop before somebody called DOCS.
Nobody mentioned how to deal with these sort of things while I was at uni.