I was driving the speed limit on a two-lane highway when I saw a 3/4-ton pickup starting to pass. I noticed his right front tire was really low so I pointed at his tire as they were passing. His passenger gave me the finger and away they went. Well at least they managed to pull away from us but a half mile down the road they were parked at the side of the road with a flat tire. I smiled, honked and waved as we passed them.