I know of it from reading Terry Pratchetts books. It is a way to restigster and perserve clown faces.
Straight Dope Staff Report: Are clown faces registered by painting them on eggs?
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Snugglesnort the Rhymer.
"Humor is the only test of gravity, and gravity of humor; for a subject which will not bear raillery is suspicious, and a jest which will not bear serious examination is false wit." -- Aristotle
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