Los Angeles police are investigating a bizarre case of trespassing that involves a man slapping a hippo’s butt at the L.A. Zoo. A video surfacing on social media shows a man hopping over a barrier, reaching down and quickly slapping one of two hippos’ behinds. He then quickly gets out and appears to give a thumbs up as he flees. Officials said it was a big risk because hippos kill more people than lions in Africa. The two hippos, mother Rosie and daughter Mara, were the ones in the enclosure.