A man bought tickets from the ticket window at a theatre on Broadway.
A few minutes later he returned and bought two more.
When, after a short interval, he came back to buy two more tickets, the ticket-seller opened the little door in the glass and spoke up.
"Aren't you the same gentleman who just bought two tickets and two others just a little while ago," he asked, puzzled.
"Yes", replied the man plaintively, "But there's some fool at the gate who keeps tearing them up!"