The game of mafia (aka Werewolf) is linked to PI (my paper: http://arxiv.org/abs/1009.1031 http://arxiv.org/abs/1009.1031, for a summary: http://boardgamegeek.c

The game of mafia (aka Werewolf) is linked to PI (my paper: http://arxiv.org/abs/1009.1031 http://arxiv.org/abs/1009.1031, for a summary: http://boardgamegeek.com/thread/1157558/polish-paper-werewolf http://boardgamegeek.com/thread/1157558/polish-paper-werewol...), also via the Wallis formula. But so what? Pi appears in physics roughly as often as 2 in finance. Even to describe the simples quantum states (ground states of the harmonic potential) you use Pi (as a normalization factor).