You’re needing some items from the store. List in hand, you get in your car, head to the local grocery store, and walk in determined to stick to your list -- nothing more, nothing less.
As you peruse the items, nicely sorted on the shelves, your mind starts to question if you actually need more than what is written on your paper. Do you pick up a sweet treat? Nah, you don’t need the calories. Oh! That cute sweater is on sale? Hmmm, maybe...ugh, none in your size. Ok. Done.