Shit rolls downhill...and most people just try to keep an eye on where the next turd comes from without bothering to watch where it goes after it's past them.
That's... So wise... Where is that from
from how to be a plumber --
Shit flows downhill, payday is on Friday.
You forgot the most important rule of plumbing: Don’t bite your fingernails.
Not enough people realize this, unfortunately. If they did our system would be flatter than it currently is. You wouldn't have "peaks", so to speak.