Hey! Mister!

I was driving along this morning when all of a sudden a shoe flew out of the bed of the pickup truck in the lane next to me. It looked like a nice shoe: bright yellow, Nike, some sleek athletic-type shoe, possibly a running shoe. It popped right out and bounced on the road, and then I was past it, and I didn't quite know what to do. Do I honk at the guy? If I end up even with him in that traffic jam up ahead, do I roll down my window, try to attract his attention, and tell him what happened? In the end, I did nothing, because, well, what was he going to do? Get out of his truck and walk back up the highway to get it?