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shopping rule theory
(media.kbin.run)
Be sure to follow the rule before you head out.
Rule: You must post before you leave.
I'm having a tough time imagining a scenario where you're in too much of a hurry to spend 30 seconds returning the cart, but not too much of a hurry to buy your merchandise and load it in your vehicle.
Maybe if you are about to piss your pants, but even then you should check inside the store first. But that's about it