Killer Rabbit

Killer Rabbit of Caerbannog
There is a 1 in 1000 chance that this hostile rabbit will spawn, and attack players who come within four blocks. This rabbit is referred to as "The Killer Rabbit of Caerbannog" in the player death screen. This is a reference to the Rabbit of Caerbannog from the British comedy film Monty Python and the Holy Grail. In Peaceful difficulty, or in Creative mode, the Killer Rabbit will not despawn and will still try to attack players, but will do no damage. Using a Name Tag on the Killer Rabbit will make “The Killer Rabbit of Caerbannog” appear above it, regardless of what the name tag says.

The Killer Rabbit of Caerbannog can be summoned with the command. Likewise, a baby Killer Rabbit of Caerbannog can be spawned by typing. Note that these rabbits are extremely dangerous, and can quickly kill an unarmored and unaware player, even on Easy mode. On Creative Mode, the Killer rabbit will still be hostile and bounce towards the player, but, like other hostile mobs, it will never be able to damage them.