James: Professor McGonagall, how do you become an Animagus?

Sirius: Hypothetically

McGonagall: . . . I can't tell you I'm sorry

James: oh

McGonagall: I also can't tell you that in the restricted section there is a book about becoming an Animagus called True Animagus Transformation. I also can't tell you that Filch will be away on Saturday 1-3 am.

Sirius: *scribbling this down*

McGonagall: you must understand I am not allowed to tell you such information

James: we totally understand professor.