Sometimes when you go a stadium to watch a game or an arena to watch a concert, you'll have the option of buying an overpriced large beer or a slightly less overpriced small beer. Go small to save a few dollars, because the small cup holds just as much beer as the large cup. More beer for your buck!
This video comes from a YouTube user who went to Century Link Arena in Boise, Idaho for a hockey game. Other stadiums probably have similar large cups and small cups so don't forget! Cheap beer tastes better when it's cheaper.