I ALMOST did that to a driver near the office last night. He wasn't planning on stopping at the stop sign but I came around the corner and startled him. Of course the redneck threw his best words. I was going to shout back since I was close enough to the bike path that he wouldn't have been able to turn around to catch me in time with his 3 buddies. It turns out about 50' later, my chain fell off due to low tension and a bump in the road. At that point I was VERY happy I didn't start something.