This is what little sisters are for.

As overheard in the car this week . . .

Claire: Ben? Ben? Ben?

Ben: What?

Claire: You cwanky, Ben?

Ben: No.

Claire: Ben? Ben? Ben?

Ben: What, Claire?

Claire: You cwanky?

Ben: I already said I'm not.

Claire: Ben? Ben? Ben?

Ben: I don't want to talk right now.

Claire: You cwanky right now?