I have a few weird habits-
I have a routine when I dry myself after coming out the shower. If I don't stick to it for whatever reason, I get back in shower and get myself wet so I can start the whole thing again.
I hate it when doors or drawers or anything of that nature aren't completely closed. If someone comes in my room and doesn't shut the door properly, I have to get up and do it myself.
All the things in my room have a specific place. My phone, MP3 player and wallet always go on my left speaker, the phone being closest to me. My keys go on top of my wallet.
Games and stuff have to all the facing the right way. My ex-girlfriend was n big gamer and she had a gaming wardrobe with this big pull-out drawer with all her games in. She used to do things like not put all the games the right way, or there'd be a PC game in the middle of a load of 360 games. I used to correct it, it drove her crazy.
When I go out, everything goes in the same place. Phone in my right trouser pocket, wallet and bus pass in the left. Keys in my right jacket pocket, my rolling tin, tobacco and lighter in the inner jacket pocket.
I think thats about it.