Haha Gab! The theory is the one that you realise that munchy is doing just fine and so there is no reason to fear anything going wrong, rather than worrying about the 'what ifs', it's the one where you think of how well-prepared you are for your exam and thus feel calm (rather than worrying about how you might go), it's the one....nup, can't defend your DH for getting home late from the pub!!