How unsettling it is to find an extra door in my hotel room.
There's the bathroom door, the closet door, and one more door.

For a moment I considered picking up the phone to dial the front desk to ask if there was some mistake.

I had asked for the best deal they had, not the haunted room with the trick door for the pranksters to escape.
I looked out in the hall. Whose room was next to mine?
Just a little green door with no room number, next to the stairs.
