Several Montana teens may face charges for intentionally spilling gallons of milk at supermarkets while their friends film the prank, a new trend called "gallon smashing." One 15-year-old boy was cited with misdemeanor criminal mischief and theft for destroying two one-gallon cartons of milk in Walmart. Police suspect three other teens may have been involved. ÃÂ"ItÃÂ's goofy," said Butte Undersheriff George Skuletich. "You might think it's a prank or whatever, but you are destroying other people's property and committing a theft."