Alright, this is just because Brian requested it. Here are some animals attacking things. The first one is long, but worth the time. It's of a pack (pride?) of lions hunting a small buffalo. The buffalo's herd fights back, including one particular buffalo who is a stud. There's also a cameo by a couple of alligators who try to steal the lion's catch. This really is an amazing video.
The second video is just of a leopard who gets pissed off and fights back.