Humor is quite complex. If someone had to sit down and explain what makes something funny, or write about it, it would be a difficult thing to do. Humor relies on surprise and taking something out of context or out of its usual use and presenting it with a twist or in an unexpected way, and the whole thing is complicated, except that if you get it, then there's an immediate recognition and it doesn't require an explanation. But if you don't get it, it can be baffling, or even disquieting. Even for people who usually get humor, there can be jokes they don't get and that leave them puzzled.