It bugs the shit out of me to be in a room with the door open. If i'm about to go to sleep, I make sure to close all the doors in my room: closet, bathroom, etc. Dunno why, i never had the "monsters in the closet" fear as a kid so its not that (in fact, wouldn't that make you wanna have an open door?).

Also, if i'm walking down a sidewalk, i subconsciously try to avoid the lines in the cement, like taking longer or shorter strides to step over them. Strange thing is i never mean to do it, i just start lol.