How about one about a cat peeing on a manuscript? The comedy is the scribe's following illustrations and notes on the page:
Here is nothing missing, but a cat urinated on this during a certain night. Cursed be the pesty cat that urinated over this book during the night in Deventer and because of it many others [other cats] too. And beware well not to leave open books at night where cats can come.
And a lovely little drawing of a cat, having a wee. :)
Effectively a reblog - go here for the full tale!