The key to success in construction is having a good plan and sticking with it. Well, this dude didn't plan of having his head stuck in a railing. Even worse is the manner in which his head gets stuck: he welds it in.
Dude probably was just trying to get a better angle to see the spot to weld and didn't realize he'd be trapping his head in. Luck for him, there's a handheld circular saw within reach. And a guy holding a camera too as a backup.