well, nerdy jokes for one thing. Like this one:
Quote:
Two sodium atoms walked down the street when one of them said: "I've lost an electron!"
"Are you sure?" the other asked.
"Positive!"
There are more advanced ones than that, but I couldn't be bothered to look for an example. I'm not all that into it.
Another thing that will make it unusual is if it's age inappropriate. Like preferring children's jokes and kiddie language at adult age.
Also humor that you think is funny but are alone in. One example from my own life: I struggled hard with maths in school. At one point I tried to make light of it while explaining how hard it was, and I said: "It's all Greek to me, so I showed it to my Greek relative, but it was all Norwegian to them."
I alone saw the humor.
As for conventional humor, I'd say one of the best sitcoms ever, Friends, is a good example of that. It has a general appeal and high rerun value.