Bad kitty!

Not only have cats been walking across your stuff when you least want it forever, but they've been doing other naughty (er) stuff all along, too...
Medieval Manuscript Peed on by a Cat - Neatorama

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.

h/t Sarah Hoyt on Facespace.