I hit a cat (well, the cat hit me!) - fortunately for me and the cat, I was going uphill at the time and only doing around 10-15 kph. I think the cat came off worse, my RS80s didn't miss a beat and there's no damage... the cat on the other hand looked a bit dazed, and groggy. After coming round, it eventually skulked into the bushes. As I was in the middle of nowhere, it was impossible to tell whose it was so there was very little I could do.
After breaking my femur in a bike accident 3 months ago, if this had ended differently I think my wife may have attempted (fat chance) to knock my cycling on the head (I can think of a Sean Kelly quote that would fit nicely as my riposte!).