Some riders just take great pleasure in annoying other people. My wife and I met such a pair on the Joe Pool dam road the other day. This is a no-motor-vehicles-allowed 8 mile out and back route that we repeat two or three times on weekday evenings, rather than playing in rush hour traffic. On many days, I take off and ride my own speed, rejoining my wife as we pass near the end of the ride. On this particular day, her 12 mph average seemed fine for my recovery mode ride, so I stayed with her the entire ride. Another couple was riding at the same time, and one of them had music blasting. They were riding at a fast enough pace to pass us, but would then take a break at every turnaround, so we'd pass them back. It seemed to me like a conspiracy to annoy me, but I guess that's just what happens when you get old and cranky.