Have you heard this one...
A famous 19th century organist wowed audiences as he traveled from city to city giving concerts. In each town he hired a young man to pump the organ while the organist played. After one particular performance the organist made his way back to his hotel only to discover he was being followed the boy who had assisted him that night.
The young boy said to the organist, "We sure had a great concert tonight, didn't we?" The organist roared at him, "We? I had a great concert. Now why don't you go home! I'll see you tomorrow."
The following night the organist began the concert by beginning to play a magnificent fugue. Suddenly, the organ quit. Didn't make a sound. The organist couldn't understand what had happened.
After a few moments, the boy stuck his head around the corner of the organ, looked up at the organist, grinned, and said, "We ain't having a very good concert tonight, are we?"
