10 Things You Should Never Do with Your Left Hand

Using your left hand to open any of the car doors on the left-hand side of your car increases the risk of "dooring" accidents (where a bicycle rider coming up alongside of the car gets hit by an opening car door). If you open the door with your right hand—a method known as the "Dutch reach"—you're forced to pivot toward the left side of the car, which means you're more likely to see a bicycle coming up on your left.