Inky paw prints presumably left by a curious kitty on a 15th century manuscript.
From National Geographic.
#this will forever be the funniest thing to me #that poor scribe just #GOD DAMN IT CAT #CANST THOU NOT SEE I AM AT WORK #ge-GET OFF YE BEAST #THOU HAST RUINED IT #NO THOU DOST NOT RECIEVE SCRATCHIES
(via)