Rabbit of Caerbannog
The Killer Rabbit of Caerbannog had a small part in the Monty Python movie: Monty Python and the Holy Grail where it played the part of a vicious protector of a mystical cave where the location of the grail is written on the wall. It (comically) was capable of jumping up as high as a human and biting a human's head off, and it did so with three of King Arthur's knights, when the knights attacked
The Killer Rabbit attacks.
it, despite Tim the Enchanter's warnings. However, Arthur and his knights had to enter the cave, so they finally killled it with the holy hand grenade of Antioch.
It was also in Spamalot.