This article from iol.co.za talks about a hippo attack on a former miss south africa in the Botswana Delta back in 2003. She was paddling in a remote area, where she and her husband run a safari company. She surprised the hippo by accident and the hippo attacked the canoe she was in, while biting her in the leg. She was the second runner up in the miss world competition, and she still got attacked by this hippo. This isnt that uncommon in Africa, as more people are attacked by Hippos than all other animals combined.