W: What do you mean ‘custard pie routine’?

M: You know, all those old films where someone gets so outraged with his boss, He picks up a custard pie and plasters it all over the other person’s face。

W: That never makes me laugh much, because you can guess what’s going to happen. But a lot of people still find it laughable. It must because of the sort of the thing we’d all love to do once in a while and never quiet have the courage to。

M: I had an old aunt who used to throw cups of tea at people when she was particularly irritated. She said it relieved her feelings。

W: It must have come a bit expensive。

M: Not really. She took care never to throw her best china。

19. C)We derive some humorous satisfaction from their misfortune。

解析：从But of course there is also a kind of humorous satisfaction in seeing somebody self-important making a fool of themselves。一句中，可知，我们会嘲笑他人的不幸，是因为我们可以从中得到一种幽默的满足，derive from 意为得到，取得， make a fool of 意为愚弄，出洋相，所以正确答案是C