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3. Not cleaning snow off their cars

How would you feel if someone heaved a 3-foot-diameter, 40-pound dinner plate at your windshield? Not too swell, we're guessing. Well, that's exactly what happens when a rooftop of snow and ice on the car in front of you goes airborne. In addition to soiling your trousers, such unwelcome... Photo by ChinaFotoPress/Getty Images