My flight was delayed in Houston. Since the gate was needed for another flight, our aircraft was backed away from the terminal, and we were directed to a new gate. We all found the new gate, only to discover a third gate had been designated for our plane.
Finally, everyone got on board the right plane, and the flight attendant announced: "We apologize for the gate change. This flight is going to Washington, D.C. If your destination is not Washington, D.C., you should deplane at this time."
A moment later a red-faced pilot emerged from the cockpit, carrying his bags. "Sorry," he said, "wrong plane."