So, you’re in a check-out line in a grocery store. You have seven items in your cart. You count them, because – above the checkout conveyor – you notice a sign: 12 ITEMS OR LESS, the sign advises. Then the realization hits: “I HATE THIS PLACE,” you scream and, with dozens of shoppers looking on, you throw everything in your cart every which way and stalk out of the store, now yelling “THE WHOLE WORLD IS GOING TO HELL!” The problem? The sign should have read, 12 ITEMS OR FEWER, a mistake not made in Safeway stores, I’m told. Assuming something like this hasn’t yet happened to you, it could…