What started out innocently enough—a Happy Meal giveaway featuring Pokemon trading cards—has turned into complete pandemonium. According to various sources, a number of McDonald's restaurants in Japan have ended their Pokemon promotion early due to customers hoarding meals to get as many trading

The meals, called Happy Sets in Japan, were meant for children. They came with a toy, such as a tiny plastic Pikachu, and a Pokemon card. They sold out in a day, according to Japanese media reports. Mounds of wasted food were found near the stores.

McDonald's Japan has canceled a Happy Meal campaign that came with coveted Pokemon cards, apologizing after resellers rushed to buy the meals and then discarded the food, leaving trash outside stores.