Maybe the creativity and out of the box thinking that blesses ADD and ADHD gives us an extra dose of sense of humor. I think I have a great sense of humor, crack myself up all the time. But a lot of my quips seem to go everyone else's head; I just get blank looks or they don't even realize I was joking. Very subtle, I guess.
And I have a good memory for jokes (and for songs, tho not for much else (???)) But I have to be careful about which jokes I tell, where when and to whom (did you notice the "whom"?) I start off, "There was this guy who ----" and across the table I see my wife's face - a look of horror, "Oh my God!" - but I usually plow on and usually get a laff.
Actually, with age and my wife's help I have learned to notice the feeling that what I'm about to say may be inappropriate, and use that as a signal (red flag) to not say it - usually.
Did you notice the "whom" quip above? It was funny.