Some people just don't like being past no matter how futile their efforts are to stay in front of you. Just the other day a Cannondale peddle only road bike was in front of me at a red light. On the other side of the light was a very steep hill. When the light changed I was going to pass him but he speeded up. We were side by side. Then my motorized 5 speed autoshift bike changed gears and I pulled slightly ahead. He had a surprised look on his face when he heard my bike change from first to second. He stood up and caught up with me then the hill became a little less steep and my bike shifted into third gear. I pulled ahead again. He started peddling harder and was slightly behind me. The road leveled out. Then my bike shifted into forth gear and I pulled way ahead of him. I looked in my mirror at the defeated look on his face. My bike then shifted into fifth and he disappeared as I left him way behind. Now that he knows he'll probably never try it again. I've probably have spent as much on my bike as he did on his.