I used to put my stash and pipe away, walk out the door, be paranoid that I didn't actually put it away and go back in to check. Afterwards I'd walk out the door again, get paranoid that when I went back in to check that I might have actually taken it back out. So, I'd go back to check again. Then walk out the door, get paranoid..........

I'd say it was some kind of obsessive compulsive thing but only happenes when I'm stoned.