To illustrate the concept—or, rather, its opposite—Langer often recounts a shopping experience. Once, when Langer was paying for an item at a store, a clerk noticed that the back of her credit card wasn’t signed. After asking her to sign it, the clerk compared the scrawl on the receipt with the one on the card, to insure that no fraud was being committed. That, says Langer, is perfect mindlessness.
— An Antidote for Mindlessness (Maria Konnikova)