Grenouille: Knock, knock!
Me: Who’s there?
Me: Boo who?
G: Don’t cry, it’s only a joke. (G falls about laughing). Mum, why aren’t you laughing?
Me: Well, I know it’s your favourite joke, and you find it very funny, but I’ve heard it so many times, the funny has sort of worn off for me.
G: Tell me a joke I don’t know.
Me: Um, OK, why did the boy throw the clock out of the window?
G (full of confidence about the structure of this one): I don’t know, why did the boy throw the clock out of the window?
Me: Because he wanted to see time fly.
Pause. G’s face is absolutely expressionless. Then the brows draw together slightly. I tense.
G: What happened to the clock?