@foxnews: "One of the most terrifying experiences I've ever had." A massive male hippo charges at a tourist boat in Botswana, lunging out of the water just feet behind the boat. The group's guide initially spotted the lone hippo and slowed down to give him space. But after watching his behavior, he issued a warning: "We need to speed up now before he decides to come after us." Moments later, the hippo was in hot pursuit. The encounter ended without anyone being harmed, but one of the people on the boat said "for a few moments, every single person in the boat was genuinely worried."