It happens far less frequently than it used to when I was young. But just last week I was riding along 6th ave near Tacoma, doing a good 15 mph, riding about 2 feet from a raised curb, and a fellow in a pickup truck pulls ahead of me in my lane, then proceeds to brake hard, then took off and then braked yet again, while turning his head , showing his pleasure. IMO he wanted me up on the side walk. I remained safely in the lane.