When we first moved into our house, our bedroom closet had a deadbolt lock on it – on one side a key hole, and the other a knob (some deadbolts have key holes on both sides). What was weird was that the key hole side was inside the closet and the knob facing the bedroom. If you can't visualize that, you could essentially lock someone in the closet if they didn't have a key. Freaked me the hell out.
When we got the locksmith re-keying all the locks in the house, he turned around that deadbolt so that the key hole side was facing the bedroom. We were thinking of removing it but he said to keep it because it's perfect if you had people coming over to work on the house or on vacation, you could just put everything in the closet and lock things up.
Every once in awhile, when I think about the lock, I still get freaked out. What the hell was that used for? Who was locked in the closet? Is the paint on the door covering up finger nail scratches on the door from someone clawing their way out? Was it one of those kinky closets? I kinda want to know and kinda don't either. The locksmith had said maybe it was for some crazy kid or crazy older person. Who knows except for that person who put that lock in there in the first place.