In order to gain an edge over competition at Superbowl finals, t-shirt companies make t-shirts with both winning teams on them. When the winner is announced, the company ends up selling the half of their stock that had the right team. I've thought of this as a great example of good pricing analysis (the value of being the first one out with a product outweighs the cost of all these useless t-shirts) but not a particularly efficient thing to do. However, a friend recently revealed one mystery to me: he was on a trip to Peru and saw all those people wearing the t-shirts with the other team apparently being the winners. So that's where all these t-shirts go!