Hippos are possibly the most secretly dangerous animal on the planet. They look harmless because most representations of them focus on making them look fat and jolly, but their hide is as tough as a rhino, they have alligator-level power in their jaws, and they are mean. It's one of my favorite bar trivia bits to throw out: asking people what the most dangerous African animal is.

I don't know how many people are gored by an elephant and live to tell about it, but it makes one heck of a story - http://www.conradstoltz.com/index.php/the-story-of-rory/