Obsessive-compulsive disorder I have some forms of it and will post up some of what I have...
1. I have to have all posts read on forums
2. I have to have the radio on a volume ending in a "5" or "0"
3. I have to start walking up stairs on my right foot and have the last step be on my left.
4. GEEK FACT: I have to rotate my right thumbstick twice to the left doing a 360 degree rotation everytime I die on Halo 3 to re-calibrate the sensitivity...haha

5. I have to eat the main course of my food before eating the side items (which I hate)
Now I know everyone has SOMETHING they HAVE to do or it will bug them....Share it!!