They know I don't like them, so they pretend to be ill, and five minutes later they are laughing and giggling with a paediatric nurse who is wondering why I 'blued' the kid in... It also happens with parents - kiddy stops breathing and turns blue, I turn up and they are happily playing with their favourite toy. Little sods, the lot of them. (In reality, kids tend to get sick quick, and then either dies quickly, or get better quickly. Annoying, but it's why I tend not to take chances with kids when they actually do look ill).