Quote from : Harry Potter and the Deathly Hallows: Part 2 Movie

Argus Filch: Students out of bed! Students out of bed! Students out of bed!
Minerva McGonagall: They are supposed to be out of bed you blithering idiot.
Argus Filch: ...Right, I'm sorry Ma'am.
Minerva McGonagall: Actually, Mr. Filch, your timing is impeccable. Could you please escort Miss Parkinson, and the rest of Slytherin house out.