some of my OCD tendencies are as follows:
*morning routine when I head to work has to be the same
*When my car is clean and shiny, no one can touch it or leave finger prints on it
*Everything has to go where it belongs or I have to put it back there
*Seatbelts cant be twisted in my car or i have to straiten them out, inlcuding the rear ones, those have to be flat and straight and not off to the sides.
*floor mats have to be straight
*If I clean the inside i have to replace the airfreshner inside with coconut tree freshner no other scent
*I have to avoid puddles when the car is clean and if i hit one i will get irritated and when i come to where i need to be ill have to wipe it clean

and probably a bunch of other things, but alot of what previous people wrote follows as well.