You’re driving calmly along when, suddenly, a small truck sideswipes your passenger door, taking your sideview mirror with it. Your heart is pounding and you both stop, whereupon the other driver starts shouting that you swerved into his lane—when you know for a fact that you did no such thing. Now it’s just your word against his. Anticipating the headache of filing a police report and arguing over the insurance claim, you think, “If only I had a video!” [More]