had a guy in a Prius pretend he didn't know what I was talking about when I pulled up to his drivers side window as he was stopped in traffic in front of our local police station. he had intentionally swerved into my space twice (threateningly) all the time looking in his side & rear view mirrors with both hands on the wheels. yeah he was gonna teach me a lesson ... scared the crap out of him when I read him the riot act. he said: "I'm sorry Sir I do not know what you are talking about" that's when I let him have it. I think he started to shake. I doubt he will ever threaten another cyclist.