ROFL - I just looked up Pig-Pen on Wikipedia - wow - never knew
   his history. His first line in 1954: "I haven't got a name . . .
   People just call me things . . . Real insulting things." -
   parodying Lord of the Flies (creepy - I didn't know that!) And
   Charlie Brown says of him, "Don't think of it as dust. Just
   think of it as the dirt and dust of far-off lands blowing over
   here and settling on "Pig-Pen!" It staggers the imagination! He
   may be carrying the soil that was trod upon by Solomon or
   Nebuchadnezzar or Genghis Khan!" "