Mc.Gonagall: Where's Mr.Black?

Peter: Doing stuff

Mc.Gonagall: I don't like the sound of that. Where's Mr.Lupin?

Peter: trying to stop Sirius from doing the stuff

Mc.Gonagall: Mr.Potter?

Peter: trying to stop Remus from stopping Sirius from doing the stuff

Mc.Gonagall: I see. And what are you doing here Mr.Pettigrew?

Peter: I'm supposed to stop you from stopping James from stopping Remus from stopping Sirius from doing the stuff