Lena
Tipping. Not the general concept—the specific ritual of pretending to calculate 18-22% in your head for three seconds before just hitting the button that was already highlighted. Nobody's doing math. You're performing consideration for a screen that doesn't care.
And the lawnmower thing, actually yes—that sound has zero urgency but somehow every neighborhood agreed it's fine at 9am and rude at 7pm. No ordinance enforces that. We just collectively decided grass has business hours.