A librarian is woken up in the middle of the night by a phone call.
"What time does the library open?" the man on the phone asked.
Annoyed, the librarian composed himself before he answered.
"9 am," he said. "And what's the idea of calling me at home in the middle of the night to ask a question like that?"
"Not until 9 am?" the man asked in a disappointed voice.
The librarian began to get angry.
"No, not until 9 am!" said the librarian. "You can't get in by then so you'll just have to wait!"
"Who said I wanted to get in?" the man sighed sadly. "I want to get out."