A man is flying in a hot-air balloon and realizes he is lost. He reduces height and spots a man below. He lowers the balloon farther and shouts, "Excuse me! Can you tell me where I am?"
The man below says: "Yes, you're in a hot-air balloon, hovering 30 feet above this field."
"You must be an engineer," says the balloonist.
"I am," replies the man. "How did you know?"
"Well," says the balloonist, "everything you have told me is technically correct, but it's no