[Stampy butts another elephant]
Marge: Gosh, I thought he'd be happier in his true habitat.
Warden: Oh, I think he is.
Marge: Then why is he attacking all those other elephants?
Warden: Well, animals are not like people, Mrs. Simpson. Some of them
act badly because they've had a hard life, or have been
mistreated...but, like people, some of them are just jerks.
Stop that, Mr. Simpson.
[Homer butts the warden repeatedly]
-- "Jerk" about sums it up, "Bart Gets an Elephant"