Reading dictionaries amuses you.
You bring a book to every social event you have to go to, not necessarily to read it, but so that people won't try to start a conversation with you.
You spent all kindergarten trying to explain to the other (obviously intellectually inferior) children how magic and Santa Claus couldn't exist. You also didn't understand why the teachers didn't appreciate your intellectual superiority.
You have frequently been referred to as a music elitist.
Whenever that happens, you're flattered.
You think of saying something, spend a lot of time on putting it in to words, and then finally when you've formed the perfect sentence, you can't remember if you've said it or not, and don't say it in fear of having already said it.
You wake up, take your pyjamas off, then forget wether you were taking them off or about to put them on, so you put them on again.
You analyse your psychotherapist.