The saddest thing you ever saw

A few weeks ago I was driving and a young gull was walking in my lane, oblivious to the traffic going by. I stopped for it, for quite a while, and waited until it stepped up onto a median. It kept on walking and stepped down into traffic, and was immediately run over by an oblivious motorist. I was still more or less at a standstill, so I saw it die. I yelled reflexively as I saw what was about to happen, but of course that had no effect. This happened on a road I drive on frequently, and for a long time afterward I could see the remains of the gull as I drove by.

That's probably not the saddest thing I've ever seen, but it's the saddest thing I've seen recently.