Little Johnny was practicing the violin in the living room while his Uncle was trying to read in the den. The family dog was lying in the den, and as the screeching sounds of little Johnny's violin reached his ears, he began to howl loudly.

Uncle listened to the dog and the violin as long as he could. Then he jumped up, slammed his paper to the floor and yelled above the noise, "For pity's sake, can't you play something the dog doesn't know!"