I've got OCD so I have a lot of little compulsions.
1) I have to alphabetise my books
2) My statues have to face the correct position

If I have to walk somewhere, I have to know how long it will take and if there are any smaller routes
4) I can't leave the house before I take everything I need, which also includes books, writing pads, pens, pencils, journals, cross stitch, etc..
5) It takes at least an hour before I leave the house, mainly because I procrastinate if I should go or not.
6) I turn off all taps at least 5 times, checking on it randomly to make sure I haven't left it dripping.
7) When I place things on a table, they have to be grouped together in a specific order.
8) I never let anybody touch me.
9) I hate germs so I can't go into a public communal, (i.e. toilets).