So normally I wouldn't take the idea that humans derive from crossing a chimpanzee with a pig very seriously, but it does make intuitive sense, and, more importantly, the Guardian says it's not true. So that raises the possibility that it's true to like 10% for me.

https://www.theguardian.com/science/occams-corner/2013/dec/04/theory-chimps-pigs-hybridisation

It's also possible that scientists have been blinded by the Darwinian speciation meme into ignoring hybridisation.

Did humans originate when a chimp fucked a pig?