I took my 4-hour standing scaffold class last night, as required by NYC for anyone who works on scaffolding. (There's a 32-hour class to build scaffold, plus OSHA classes.) Part of the class was watching video of various idiots doing things that, hopefully, everyone in the room already knew they shouldn't be doing.
One video helpfully included pictures of two men's groins after their their testicles had been severed by improperly-fastened safety harnesses.
Here's one worn properly, from an equipment catalog: