Goodbye.

Claude:
[the gang is waiting inside the car for One-Round, whose cello case is caught in the crack of the front door of Mrs. Wilberforce's flat]
What is that moron playing at? One-Round:
[Yelling]
It's stuck in the door. The case is stuck... Harry:
[Interrupts]
Well, ring the bell, brains. Don't just stand there. Harry:
[One-Round rings the bell]
Thank you. Professor Marcus:
[One-Round keeps tugging at the cello case while Mrs. Wilberforce approaches the door to answer it. All of a sudden, because of One-Round's constant tugging, the cello case rips open, causing all of the banknotes inside of it to flutter out just when Mrs. Wilberforce opens the door and catches him in the act. Seconds later, everyone in the car quickly comes out to help One-Round stuff all of the banknotes back into the case. Professor Marcus tries to put everything at ease]
It's all right, Mrs. Wilberforce. Everything's under control. Goodbye. Professor Marcus:
[Professor Marcus closes the door, but Mrs. Wilberforce is still a little skeptical. She cautiously opens the door, after a few seconds of hesitation]
Goodbye. [Professor Marcus closes the door again]