Had a bad scare with the bunnies a little while ago. 
As some of you may know, I've recently started volunteering at the local HRS shelter. I picked up a lot of bunnies there while I was volunteering earlier today, and I didn't change out of my fur-coated shirt before visiting Mr. Bunny and Ms. Rabbit. Big mistake.
As soon as I sat down with Mr. Bunny, he immediately lunged at Ms. Rabbit. They suddenly started fighting viciously - the same way they fought when I had just started bonding them. Ms. Rabbit was running so fast, I was afraid that she'd break a foot. Fortunately, I was able to catch Mr. Bunny and separate them before anybun was seriously hurt. As far as I can tell, the only injuries are a minor (but bloody) scrape on Ms. Rabbit's back and possibly a minor foot or belly injury on somebunny.
After calming down the bunnies and treating Ms. Rabbit's wound, I put them down in my bathtub with some hay and their litterbox. They've been snuggling ever since. Mr. Bunny still seems very frightened, but neither bunny seems to be angry. I'm going to leave them in the bathtub until I give them their veggies in a few hours. If they're still friends by then, I'll move them back into the bunny room.
Moral of the Story: If you have a very territorial bunny like Mr. Bunny, always, ALWAYS change your clothes and wash your hands if you've been around other bunnies.
EDIT: I think I've figured out why they reacted so badly to the strange bunny smell on my shirt. The last two weeks that I've volunteered at the shelter, Mr. Bunny didn't react to the bunny smell at all, and Ms. Rabbit jut chinned me a few times. We're having some very strong (65 mph) winds at our new house, and my formerly-basement bunnies weren't used to the sound of the strong wind or the cold draft coming from under the door. Now that I think of it, both bunnies seemed a little spooked even before I sat next to Mr. Bunny. I guess the strange bunny smell just sent him over the top.