Poop and Ha-ha

Well before the crude humor of South Park, humans were thoroughly amused by fart jokes. The BBC reports that the oldest known joke is a Sumerian proverb circa 1900BCE. The topic? Flatulence of course.

Something which has never occurred since time immemorial; a young woman did not fart in her husband's lap

Personally, I found the Roman smear against Augustus' mother – a first century CE version of “yo’ momma’ perhaps – to be the funniest of the antediluvian gags.