Piles of untouched Happy Meals littered sidewalks outside McDonald’s restaurants in Japan as frenzied customers scrambled to buy limited-edition sets with Pokémon cards over the weekend.

The ‘little monsters’ cards are extremely popular among both children and adult superfan collectors, with some going as high as millions of dollars in value.

The fast food chain has apologised after resellers rushed to buy the meals and then discarded the food outside stores.