Those Wacky Cavemen

I've wondered through the years what was the first joke. Not the first recorded joke, mind you, but the first ever joke. When did irony creep into human interaction? Did Homo Sapiens tell Neanderthal jokes, like, "did you hear the one about the two Neanderthals out fishing in a dugout, and the fishing was so good they wanted to return to the same spot the next day, so one of them suggested carving an "x" in the bottom of the boat?" This one acquired an additional punchline when it became a Polish joke, but hey, that was a few hundred thousand years later. Jokes don't just spring up fully formed overnight, you know. I've heard the Egyptians carved some really hilarious comic strips on the walls of their burial chambers, so the dead could have a good chuckle in the afterlife.