"I'm The Tidy Fairy, " replied O. "Except I'm dusting becuase I like that better than tidying."
"The Tidy Fairy?"
"Yeah - you know. The one who tidies our bedrooms."
And at that point I realised that 6 year olds don't really get sarcasm.
I won't be saying 'Who do you think tidied your room? The tidy fairy?' any more. I want some credit around here.