haha I watched a documentary about wildlife in Africa a few months back and man I can't believe how crazy Hippo's are. You think they are only some lazy fat animal? wrong!!.. Hippo's are extremely intense and they kill more humans than any other animal in Africa every year.
In the documentary the Lion were absoutley terrified of Hippo's, straight up pooped themselves. This adult male Lion was drinking some water and the Hippo got annoyed and chased the Lion and the Lion look petrified haha. The Hippo was also bullying the Crocodiles in the same river too, and also bit a Croc in half.
Hippo's have to be the most aggressive vegetarian animal ever I think. They might be 100% vegetarian but don't be fooled, they are incredibly powerful and very aggressive.