I just can't make jokes up... Shamefully I've been caught stealing other peoples.
Although I do think I have a good sense of humor it's not traditional one because the darkest things make me laugh.
As an example... I once saw a dead body being fished out of a river. When they put the body on the stretcher the arms were sticking straight up. (because of rigor mortis)
I really can't explain it but I found that terribly funny.