Nothing too exciting.

The easiest one is: sexually attracted to the two most popular genders. (Possibly to others as well; I don't know.)

In my twenties, I was involved in some lexical priming studies in which I seemed to be a radical outlier in terms of how long secondary meanings of words stayed activated as I processed a sentence... I was several sigmas out on the right-side tail of the results I saw. There's a pretty obvious just-so story to be told about the relationship between that and the ability to notice alternative interpretations of an utterance, which is something I'm unusually good at in my cohort.

I suffered pretty severe brain damage a few years ago and recovered from it... fully, as far as I can tell.

The last thing I can remember having the "Oh, other people do this too?" experience about was the photic sneeze reflex, which according to wikipedia is actually pretty common.