A game to play when you're bored. It looks like you're really interested in what the teacher has to say. But in reality, you're just waiting for him to say "put your hands up" so that you can all mutter "my arse" afterwards.

With a good enough mental library of double entendres, just about anything the teacher says can be followed with "my arse", with hilarity inevitably ensuing.

Oh, and Mr Jones, once you've realised just how immature your class really is, moaning 'oh come on...' isn't really going to help matters.