Five minutes later, he calls the desk and says, "You've given me a room with no exit. How do I leave?"
The desk clerk says, "Sir, that's absurd. Have you looked for the door?"
The person says, "Well, there's one door that leads to the bathroom. There's a second door that goes into the closet.
And there's a door I haven't tried, but it has a 'do not disturb' sign on it."