A man went to a hotel and walked up to the front desk to check in. The woman at the desk gave him his key and told him that on the way to his room, there was a door with no number that was locked and no one was allowed in there. Especially no one should look inside the room, under any circumstances. So he followed the instructions of the woman at the front desk, going straight to his room, and going to bed. The next night his curiosity would not...