Joke stolen from: NorthCoast Express(tm)

I have a brother who was on a plane that had taken off and was approaching cruising altitude, when one of the flight attendants came on the public-address system. She announced that she was sorry, but the plane's restroom was out of order.

The flight attendant went on to apologize to the passengers for any inconvenience. But then she finished cheerily with: "So, as compensation, free drinks will be served."