I'm sure you'll find this a most fascinating dungeon. That lovely rumbling sound you hear is one of my favorite prisoners! He was a bass drummer in an orchestra I once conducted, had a very bad habit. You know that part in Beethoven's Fifth Symphony, where the drummer is supposed to go 'A-boom-boom-boom-boom?' Well, this stupid lout always went 'A-boom-boom-boom-boom... A-boom!' One extra boom, you know. He'll be here forever.

[they see a man beating an enormous drum repeatedly]

You mean he has to keep beating that drum forever?

Oh, that isn't the man I'm punishing! My man is inside the drum!