Imagine you're buying an ice cream: one scoop for £2 or two scoops for £3. Then the seller adds a third option-two scoops with a fancy topping for £4. Suddenly the plain two scoops seem like a great deal, even if you didn't want that topping! That sneaky extra choice can change what we pick. Or think of picking a phone plan: a cheap plan with little data, a pricier plan with lots of data, ... almost as expensive as the big plan but gives barely more data. Suddenly, the big plan looks way better. What's behind this trick of our brains? Take the quiz to find out what's really going on here.