I was happily driving along a country road, just north of Los Santos, and a deer ran out the side of the road. I tried to avoid it, but twatted the frigger. The "thwunk" when I hit it felt pretty real.
Anyway, I stopped for a second, still in the car, to survey the damage and another car coming towards me swerved to avoid the deer carcass, and crashed into a tree! Brilliant!