Luckily I've never hit anything too damaging, I think my only roadkill is a lizard out in arizona.
I've been riding with my dad though, he's had worse luck; broke a friend's skateboard in his '65 mustang (pissed him off, but didn't damage car). Another time late at night we came upon a cat sitting in the middle of the road staring at something, the cat ran off, but the possum it was staring at didn't. Seemed like we were gonna wreck our Civic because it was so low, lol. Luckily there are plenty of possums around, so 1 won't do too much harm to the car or enviornment