You joke, but my wife has actually been attacked by a bunny. She made the mistake of trying to break up a bunny fight, and one turned on her. It broke the skin and left a bruise a good 3 inches across around the bite mark.
So, don't immediately assume that Franko is crazy!!! Maybe he just heard the real voices.
No I've kept rabbits as pets for the last 35 years and I know the little buggers can be mean at times. And every spring, me and the wife like to watch the local male cottontails having what we call "bun wars", because they're very agressive about their territory.
Watching the little guys go face to face, then one hops in the air, and they chase each other around like they're demon pocessed. Its hilarious! So, no, I know bunnies have an evil streak.
Trying to break up a fight between two of them? What was your wife thinking?
As Monty Pyththon would put it they've got big nasty "fangs".