Watching the video linked:
“Why are you crying?”
“Because I’m so stupid…!”
“That’s no reason to cry…”
It takes a certain level of reasoning to realize he just agreed with her that she’s stupid; another level to realize that he’s so dumb (disconnected?) that he doesn’t realize what he did. Below a certain level of reasoning ability, the watcher would nto be able to connect the dots.
I suppose smarts is a way to figure out the full implications of something; humour is the ability to see the non-linear parts of the connections - the surprise.
Joke time:
How the various profesions determine that all odd numbers are prime:
Mathematician, “1 is prime: 1+2=3 is prime; 3+2=5 is prime; 5+2=7 is prime. Therefore, by induction, all odd numbers are prime.”
Physicist, “1 is prime, 3 is prime, 5 is prime, 7 is prime, 9 - experimental error, 11 is prime - therefore all odd numbers are prime.”
Engineer, “1 is prime, 3 is prime, 5 is prime, 7 is prime, 9 is prime, 11 is prime… all odd numbers are prime.”
Of course, the people with no sense of humor chime in with “But 1 isn’t prime…” I told that to a roomful at a party with several physics and math professors in it, and they laughed; my brother with the MA in engineering said “Hey, wait a minute…”
I took a test in high school and measured out at 130, which I thought was not too bad. But I know I’m not the brightest, nor the stupidest, and not quite the funniest…
I never met real dumb people until I droppped out of college and went to work in a blue-collar job. The problem is that some of them are so dense, they cannot connect the dots as mentioned above. The problem goes both ways. It’s not just that the lower-end people don’t get the jokes. The smart people get tired of talking to people who then fail to apply what they’ve been told. The difference is, if they are not too far apart, that the lower-end thinkers are not so dumb that they don’t see what’s happening. An IQ 70 may be well aware that he’s being talked down to, but knows everyone does it. An IQ 100 does not like being talked down to, because he can function as well as most of his peers; and he’s perceptive enough to know when he IS being condescended.
So I don’t think it’s the humor; that’s just part of a broader concersation. As mentioned in earlier posts, what interests people? What would they have in common. What appeals to us depends on what we think of as neat or cool; which is what gets us thinking, as puzzles, as stuff to ponder. The level of puzzle that interests someone depends on their reasoning ability.
OTOH, there is cultural stuff at work too. I have minimal interest in sports; I read science fiction; I like reading history, humour, and trivia like we find here. I would find it difficult to relate to someone who does not share at least one interest.
So like any other problem, humour and IQ is only a part of the answer. There are many other factors that go into a friendship.