Centurylink Arena in Boise, Idaho, sells beer in two sizes. A $4 small and a $7 large. The $4 small gives you 16 ounces of beer in a plastic cup. The $7 large gives you... 16 ounces of beer in a slightly taller cup:
Two fans got hip to the scam and made this video, which went viral. The arena has apologized and called it a mistake. OF COURSE IT WAS!