Brian! "tagged" me (and a few other folks) to tell about six bizarre activities in which I habitually engage.
I have a compulsion where I have to do the same thing the same number of times with both feet. If I step across a crack in the sidewalk with my right foot, I also have to step across a crack with my left foot or else I'm all whoppyjawed. I can't walk around with one sock or shoe on and one sock or shoe off because then I'd be "uneven". Luckily, I'm not really plagued by OCD, and I'm easily distracted from keeping track of my feet.
I always listen carefully to what people say, and if there's any ambiguity, I consciously misinterpret what has been said (while knowing exactly what was meant). For example, I'm amused by the television commercials that say, "Report all allergic reactions to your doctor immediately." I always shout, "Allergic reactions to your doctor!?!" Also, on the news this evening, the sports reporter said, "He had been helping his grandson with golf since he was three years old." I immediately responded, "I didn't know that you could have a grandson at age three!"
Obviously, I talk out loud to the television. A lot. And I sing along. A lot.
I habitually crack my wrists. People have told me that it is really disgusting to watch. (Incidentally, my left ankle cracks all the time, whether I want it to or not, but I am unable to crack my right ankle.)
I actually enjoy playing the bari sax!
I sometimes stay up late at night writing mathematical proofs. I can't go to bed until I've solved the equations. I think that these occasional lucubratory intellectual sprees are actually mild manic episodes, but fortunately they aren't that frequent or diuturnal.
(7. I have a habit of gratuitously using really big words.)