This one recently discovered in the Dordogn in what archaeologists are interpreting as the canteen of an Upper Palaeolithic cave system.
Festooned to the cave wall with a primitive form of resin-based blue tack, the poster overlay an early Banksy (loin cloth period) as well as the following pithy profundity:
What’s the difference between a Buffalo and a Bison? You can’t wash your hands in a Buffalo.
Jokes GOOD… but also BAD