A killer rabbit guards the entrance to the Cave of Caerbannog in Monty Python and the Holy Grail.
King Arthur and his knights encounter the apparently harmless white rabbit while searching for the Holy Grail. The creature suddenly attacks, killing several knights and forcing the group to find another way to defeat it.
The scene is one of the film’s best-known comic reversals. Medieval romances often describe terrifying beasts, dragons, giants, and supernatural guardians, but the film turns that convention into absurdist comedy by giving the monster the appearance of an ordinary pet rabbit.
The characters eventually use the Holy Hand Grenade of Antioch against it. That fictional weapon parodies the solemn language and ritual instructions associated with religious relics and medieval adventure stories. The rabbit is therefore a comic invention of the film, not a creature from traditional Grail legend.