It's pretty tough to tell hippopotamuses what to do. They're very large and don't exactly take direction. That's what one village in Montenegro learned firsthand. In 2010, after some flooding in the area, Nikica escaped her pen and made her way into a body of water in the nearby village of Plavnica. The villagers didn't mind Nikica swimming around their homes, though, and she ended up being a pretty popular celebrity in the area. She was eventually brought home after floodwaters receded.