BONES of full fifty men lie strewn about its lair! GIF

With really sharp teeth!

Killer Rabbit of Caerbannog ;)

There's a rare chance that a spawned Rabbit (in Minecraft 1.8) will have red eyes and try to murder you brutally by jumping at you. 'Nuff said.

Quick someone bring me the holy hand grenade

Tim: That's the most foul, cruel, and bad-tempered rodent you ever set eyes on!
Sir Robin: You tit! I soiled my armor I was so scared!
Tim: Look, that rabbit's got a vicious streak a mile wide! It's a killer!

Little bunny Foo Foo
Hopping through the forest..