...you know that the cheapest place to get pasta and rice pudding is Tesco, but that Sainsbury's is cheaper for honey, lemon curd and free-range eggs; you are aware that Value pasta is about fifteen times more pleasant than Basics; and you have also discovered that Basics and Value vegetable soup are identical in scent, appearance, texture and taste.
when you put yourself through two hours of Christians lecturing you on becoming a Christian just for a free sandwich.
Or when you drink a can of (free) energy drink that you have lying on your desk at 11 o clock at night because you can't be bothered going to the kitchen to get a normal drink.