I used to bite my nails, then a front tooth had to get a crown. So now I pull my hair. It was becoming trichotillomania, but I've managed to almost completely stop pulling the hair out. Now I just run it between my fingernails, it's at it's worst when I'm stressed.
I have to clean sinks, can't stand sinks with hair and crap in them. Yes, even in public restrooms.
I like to have my paper money lined up, heads up, facing forward, with denominations organized, front to back, starting with $1 bills, then $5, $10, $20 and so on.
I HATE IT WHEN PEOPLE WIPE SOMETHING WITH A SPONGE AND DON'T FUCKING RINSE OUT THE SPONGE! YOU'RE CREATING A BACTERIAL SOUP ON THE GODDAMNED THING AND IT STINKS! I finally got so frustrated with it that that I informed everyone that I will no longer handle these sponges, I will simply throw them out. After smacking them in the face with that stinky-ass shit.
Of course, there's more.