A drunk staggers into a church one evening, goes into the confessional box and sits down. He doesn't say a word.
The priest coughs to try and get his attention. There's no response so the priest coughs again. There's still no response from the drunk.
The priest coughs a couple of more times and still doesn't get any response, so finally he pounds on the wall.
The drunk slurs, "There's no use knocking. There's no paper this side either."