A hillybilly named Billy Bob checks into a hotel for the first time in his life and goes up into his room. After a few minutes, he calls the desk and ask "My room does not have any exit. How do I get out ?"
The reception clerk replies " Sir, that's ridiculous. Have you looked for the door ?"
Billy Bob replies "Well, there is one to the bathroom. There is second door to the closet. But there is another door I have not tried. It has a "Do Not Disturb" sign on it.