So there was this research lab in, let's say, Stanford, looking into the genetic similarities between chimps and humans. They had always assumed that, since the two populations did not interbreed, that they could not interbreed. Then a lowly undergrad research assistant questioned this assumption, and they were forced to admit it had never been tested. Of course, for purposes of the story they weren't interested in whether this could be done in vitro, but rather the old-fashioned way. None of the researchers could stomach the idea (picky, picky), and they figured they would have to offer a fairly substantial payment in order to attract a "volunteer". So they put an ad in the local paper: "Wanted: Man to have sex with chimpanzee. $2,000." A couple of days later, they get a phone call from an interested man, who says "I just have three requests: First, I gotta have a couple of beers. Second, I get to choose the chimp. And third, you're gonna have to give me a couple of days to come up with the two grand."