It was half past three. The doctor had just lain down for a nap when he heard a loud knock on the door. He got up and asked the man at the door, "What is it?"
"I've been bitten by a dog," said the man painfully.
"Well, don't you know that my hours of consultation are between twelve and three?" said the doctor unpleasantly.
"I know," groaned the man, "but that confounded dog didn't know. It bit me at twenty past three."