I have people say that about me sometimes. One time I wrote on my Facebook page "Oral Roberts died yesterday, I always wondered if he had brothers and sisters. And if he did, what were their names?" I thought it was hilarious. Only one person got it, my cousin. Other people took it seriously and wrote things like "sorry, I don't know if he had any brothers or sisters."
One time this guy I know said he was giving mind massages. I asked him what a mind massage was, he glared at me and said "I just gave you one." I thought that was really funny.
Once an ex girl friend and I saw this girl selling tee shirts at a concert. My girl friend said "I think I've seen her before, she's a belly dancer." She asks the girl "are you a belly dancer?" and she answers "No, I sell tee shirts." I laughed out loud.
Once I went to a Taco Bell and my order was "a cheesy bean burrito, some cheesy fried potatoes, and a big cup of melted cheese to drink." The poor guy just stared blankly and said "huh?"
Sometimes something just strikes me as funny and maybe most people don't think it's funny.