I have a friend who is a "rough character" construction worker. He was going home from work one evening, going through the country to a small town a few miles away. He turned off the main road and came upon a herd of deer crossing the road. He stopped to let them pass, and while waiting he noticed another truck coming up behind him. As he pulled off from the stop the guy behind him swerved from side to side a couple of times and then started flashing his lights.
My friend said his first thought was it was someone who was upset about something in the past, so he wasn't going to stop out in the middle of now where. But he kept flashing his lights. When he got into town he pulled over, and the guy pulled in behind him. As they both got out and walking towards each other a deer jump up out of his pickup and runs off.
The guy behind him saw the whole incident and was trying to warn him of the deer in his truck bed.