Sometimes, movie productions have been struck by unfortunate cases of real-life crime, ranging in severity from what amounts to a dangerous prank to actual murders ...
The movie that made parents gasp, teens horny, and caused an entire generation to become insufferable by randomly yelling, “A plague on both your houses!”
Action movies love that loud CH-CH sound guns make, but in the real world, you definitely don't want a firearm to sound like an Altoids tin full of nickels.