Sirius: Remus. It's a perfectly fine plan.

Remus: No. No, it isn't.

Sirius: you don't just get to say no.

Remus: This plan involves me! I get to say no! No.

Sirius: Remus-

Remus: Let me introduce you to my good friend no.

Sirius: Maybe we can compromise.

Remus: No.

Sirius: REMUS.

Remus: 'no' is a magical word. Here's how it goes. You say,
               'Remus, I have an insane suicidal plan. Would you                                           
                like to help me carry it out?' and I would say 'why  
                no'.