A conversation with Charlie...

Charlie: 'Is the tooth fairy real, Mum?'
Mum: 'Well, the tooth fairy's a bit like Father Christmas...'
Charlie: 'So why don't we see them?'
Mum: 'Maybe they only come at night, when you're asleep.'
Charlie: 'Oh I see. They're nocturnal.'

Don't you just love the things kids come out with?!