Spearthrower made of antler showing a young ibex with an emerging turd on which two birds are perched, found around 1940 in the cave of Le Mas d'Azil, Ariege. The ibex figure is about 7 cm long, and dates to about 16000 BP.
This was one of the first examples of mass produced art. Fragments of up to ten examples of this design have been found, which means that scores or hundreds must have been manufactured originally. The joke must have been very popular amongst the people of the time!
Photo: Bahn (1998)
Its not the same as "years ago" though. That's from now, which is constantly moving. BP means "before 1950, when nukes fucked with radio carbon dating."