This new post:
Fixing a Bullet Damage on a Car (purely hypothetical)
…reminded me of how car doors in TV and movies are always bulletproof-- cops and bad guys alike will hide behind their open car doors during shootouts, and never seem to get hit by a shot through the door, even by high-caliber automatic weapons.
(I’m guessing that was already mentioned in this thread, but I don’t have half a day to look it up through 2800+ posts 
)