When we were in Diagon Alley,' Harry began, but Mr. Weasley forstalled him with a grimace.
Am I about to discover where you, Ron, and Hermione disappeared to while you were supposed to be in the back room of Fred and George's shop?'
How did you...?'
Harry, please. You're talking to the man who raised Fred and George.

Auteur: J.K. Rowling