My recent most obvious OCD problem is back to the old driving and harm issue subject. It happens regularly.
I get in my car, and look behind me while I back out of my driveway. Thus far, I'm a normal person. Then, I wonder if maybe a neighbor happened to be in my way and got hurt when I backed my car out of the driveway. Then, the "responsible" thing seems to be to check to make sure there are no injured people in the driveway.
Cognatively, I realize the very low probability. First, I was looking when I drove, so unless someone was laying right behind my car, I probably would have seen them. Even if they were hidden right behind my car, I probably would have seen them when I approached my car to get in. And then, even if my eyes failed me, I would have felt something if the car had hit anything. I know the sound of the car brushing into plants on the side of the road (leaving them unharmed) (I used to live in the country). So it is pretty sensible that if there had been a problem, I would have felt it. But once I wonder if I've hurt someone, or even if I jump straight to thinking I should check just in case like I usually do, not looking at where I just drove seems unthinkable. It strikes me as an unacceptable risk. You don't just accidently hit people with your car and then drive off without looking (this statement remains true, but the context is off since no-one was hit). And somewhere in there must be the OCD misthinking. Because I jump from a what-if to an if-then that is not far enough from a faulty since-then.
Okay, now I've thought it out. Cognatively, the risk is in the acceptable realm. Emotionally, it's not, but I'm gonna have to disobey my emotional reasoning. Maybe now I'll go ahead and do the response prevention.