or why I’ll never walk across a bridge built by my mother.
It’s Common Knowledge either by experience or paying attention, that if if smooth something (nail) goes in, enough force makes smooth something come out the hole. That’s why screw’s screw in instead of *push* in. I’m not the most handy person on earth but even I know when to use a nail and when to use a screw. Unless you want to get screwed by physics,