Even OSHA compliance is no guarantee of safety. A mook (usually) standing behind a railing, usually about waist-height, on an elevated surface who is shot during a firefight will invariably fall forward and flip over the railing, falling to his (presumed) demise, probably Wilhelm screaming on the way down. Conversely, someone standing in front of a railing will flip backward over the railing. This occurs even if the mook was shot from the direction of the railing with a weapon that normally throws people violently backwards. The phenomenon that causes this is called Ledge Gravity, and specifies that people will tend to fall in the direction they'll fall furthest because there's more gravity that way.