When I was in High School, I had a "friend" who's family was just a little south of strange. They had a baboon they kept in a cage in their back yard, near their pool. You couldn't go near the thing.
One day, I get a call from the "friend" to come see their newest pet. Turns out they had adopted a hyena from someone in Africa. It's name was Jeep, since that is supposedly close to the African way to say hyena. Anyway, they actually had a dog trainer come out (I was there the first time...to watch) to try to train Jeep. Things didn't go that well.
Also, Jeep just loved to nibble at your ankles. Considering those jaws can crush bone, it was a little un-nerving, to say the least, to have him biting at my feet!!!!
End result was that, several months after Jeep's acquisition, he supposedly attacked the father, who got ripped up in the attack. Father went back to the barn, where Jeep was kept, and shot him.