It wasn't on a B12, but I ran one of those HUGE raccoons that Billster mentioned over. I was riding the backroads of the Poconos, with my lady on the back. It was an easy ride, so she was star gazing, enjoying the mid-summer weather. All of a sudden, I see the little bugger on the side of the road. I got on the brakes, but couldn't really swerve because the lady would have been thrown off. SO the little guy starts running for the road... We make eye contact, he aims for my front wheel, and goes under.
The worst thing was that is that as we passed over him, I could hear every single bone cracking, in slo-mo.