My dad got hit by a deer while driving. The deer ran into the side of the car and knocked itself out cold. When my dad got out to check on it, another driver pulled over and since the deer wasn't moving, went back to his truck to get his shotgun to put it out of it's misery (it's the south. People drive around with their shotguns.). The minute the guy turns around to come back and shoot it, the deer gets up, staggers, then bounds off into the woods perfectly fine. My dad's car was pretty messed up though.
So when you see a deer or moose crossing sign, keep a watchful eye. You could hit a deer, or they could hit you.