Back in the Middle Ages copying books was a long laborious task. The scribes would sometimes doodle in the margins to alleviate the boredom, giving us a chance to travel into the past and gain an insight into the minds of those long forgotten writers.
Here's a doodled rabbit taking on a snail in a 1302 manuscript.
Or what about this one from an 800 year old Bible? Imagine reading out Mass with this guy watching you.
Some of the written gems from the 12th through to 15th century include:
"While I wrote I froze, and what I could not write by the beams of the sun I finished by candlelight."
"This is sad! O little book! A day will come in truth when someone over your page will say 'The hand that wrote it is no more.'"
"Now I've written the whole thing: for Christ's sake give me a drink."
"F**k the abbot."
"Writing is excessive drudgery. It crooks your back. It dims your sight, it twists your stomach and your sides."
If you want to know more about medieval marginalia, this article
is a great place to start.