Lost in a balloon
"We're lost! Can you tell us where we are?"
The man thinks for a while, looks down, looks up, looks down again, stares into space for a minute, and then cries out:
"You're in a balloon!"
The wind picks up, and the balloon floats off. After a moment, one balloonist says to the other:
"That man must be a manager."
"Why?"
"Three reasons. First, he took a long time to answer. Second, he was perfectly correct. Third, his answer was perfectly useless!"