Hate to have to point it out, but...
Almost ALL humor, clear back to Ug stubbing his toe on a rock and hopping around, is based to some extent on the misfortune of others.
Think about almost any comedy routine or famous comedy movie or sketch. What's happening?
It's more complicated than this, of course. For example, there is a big difference between laughing at someone who really falls down a manhole in front of you and injures themselves, or laughing when Larry, Moe, and Curly fall down a manhole. But the basics are there.