I have moderate OCD and i work hard to keep it under control.
BUT one manifestation that is particularly annoying is "walking" OCD.
I haven't driven for a long time cuz i live in NYC, so now I have obsessions about knocking into someone, walking "crooked" or not paying attention and in some way causing another pedestrian to fall into the subway tracks, get hit by a car, fall down the stairs, etc.
As with any OCD symptom, I know this is irrational. It'd be pretty hard to cause this kind of accident and be oblivious to it. Plus it is other people's responsibility to watch out for themselves, too. BUT rationalizing doesn't help, as usual.
Tonight, for example, I had a cocktail at a restaurant when I was dining alone. The drink made me pleasantly tipsy, but then as soon as I got home I started obsessing that maybe I had hurt someone in the way described above, because I was so impaired by the alcohol (come on, please!)
One thing I REALLY want to do is eventually start driving again, but I am pretty sure that the "walking" obsessions will just change into "hit n run" OCD driving obsessions. Back when I used to drive, I would obsess that I had hit someone and it was awful.