It is a piece of green slime that when someone ingests it, it can inflate the person and generate some more effects such as skin color, spitting slime, inflating itself and among others. Slime is edible. There is no possibility to explode as full as possible. The slime is easily mushy and when the human gets inflated, it also becomes soft and sticky, plus the nose or mouth leaks slime. There's no clue where, why and when they put the box with slime inside, just a piece of slime.