the grocery store checkout line that moves faster is almost never the one you're standing in. i've studied this. the number of items is not the reliable predictor. price checks, coupons, first-time card users, items with no barcodes — these are unpredictable variables that appear in every line with equal frequency. you chose correctly. the other line just has better luck today
the tip screen on the ipad at the counter of a fast food restaurant that's been there for six months. every time. three buttons: 18%, 22%, 25%. no $0 option. or there is one but it's small and in the corner and it feels like you're doing something wrong. i know exactly what they're doing. i understand the mechanics. i still feel slightly bad every time i press 'no tip.' it's working