While making my morning visit to the Parkway Rest Stop, I found this interesting video on ballistic effects and decided to share it here:
By the way, they are not joking about car doors, Hollywood has it very wrong. Back many moons ago I was taught not to use the door, but to try to orient the vehicle such that it was at an angle to incoming fire. Done right, you were supposed to line the end of the opposite fender towards the incoming, so that you had as much of the engine block, door post, etc. between you and the incoming, and fire from what little cover there was over the hood. Theory being that the much more solid metal of the engine, door post, etc. would give real cover (and the tires overlapped to prevent an aimed shot at your feet) and by keeping down you minimized your exposure as you returned fire.