Seriously, I wasn't even through the second paragraph before I thought the same thing - just take the thing with you. It doesn't try to solve the OCD, but it solves the problem. Nobody in my household has OCD, but we had a garage door that sometimes, unpredictably, would decide that there was an obstruction at the very bottom, and go back up. Did you really, really watch it go all the way down before driving off? Did…
> Engineer's solution rather than psychiatrist's - simply rig something that lets you check over the internet and close the door (but not open it!) if necessary. Wouldn't necessarily work for OCD, as the obsession can easily morph into "Did the sensor fail?" I can see it being helpful though.
The real fun one is if you need to stare at the latch as well, just in case it looked closed, but wasn't...
That said, this particular story has been repeated a bunch, or at least I've heard it before but I can't quite remember where. I'd be interested if anyone's found a proper source for it, but not quite interested enough to go hunting myself. :)