Like he was telling her anything she didn't already know! Madeleine had amassed several year's worth of detentions by this time from Muggle schooling, had gotten into trouble from her own parents, her friends' parents, even strangers in stores or parks--she had this thing.
"Cleaning toilets?" she guessed, both eyebrows raising slightly. "My mum used that punishment when I was eight."
There was a chance she was wrong, of course, but Madeleine's guess was that the one she was appalled by was going to be the one he laid on them. That had been the way her teachers functioned, at least!