Clowns take their makeup seriously - it's bad form to use someone else's makeup and hairstyle. So Matthew Faint runs the Clown Egg Register, a gallery of clown faces painted onto eggshells that serves as a sort of "copyright register" for clowns. https://www.ft.com/content/56cac980-e8f9-11e2-aead-00144feabdc0
@noelle clown copyright is serious stuff
@noelle The idea is so strange that you might have guessed Terry Pratchett made it up. I had a feeling the egg collection in the Ankh-Morpork Fools' Guild was just weird enough to be true.