This cartoon may be a little morbidly funny, but jobsite safety is no laughing matter.
And guessing about what "should hold it" is risky. In my younger construction worker days, I knew an older worker who swore that 3" grabber screws could support anything. "They'll hold the world!" he'd say. That seemed reasonable to me then.
As structural engineers, lives depend on our making certain everything we design will definitely "hold it," and we take that responsibility very seriously.