10 Insane Rules The Big Bang Theory Cast Had To Follow

Even though many of The Big Bang Theory's conditions sound ludicrous at first, they do make sense when you understand the logic behind them. But there's one rule that everyone on the show must abide by, even though there's no real rhyme or reason to it - when called upon, the cast and crew must take part in a flash dance.

Unbeknownst to the writers, Kaley Cuocco choreographed a dance routine with the cast and crew for two weeks. Before taping one episode, almost everyone in the production took part in a flash mob, with Carly Rae Jepsen's Call Me Maybe playing in the background. The audience loved it so much, it became a time-honoured tradition. Over the years, the gang have performed flash dances to Uptown Funk, Gold Digger, Run the World (Girls), and Larger Than Life.

These dance sequences may not be necessary but it's a great way for the cast and crew to blow off steam after a long day of filming. Also, it's such a great treat for the audience, you can understand why the flash mobs became a staple during filming.