'An ice-cream seller has special ice-creams that have effects such as making people happier, shortening peoples' noses, removing pimples, and making people smarter. A smart boy who is always top of the class gets jealous, because he never gets any of the ice-cream and also because one of his classmates becomes as good as him, so he ruins the ice-cream business by destroying all the ice-cream except the one that makes people smarter. He then proceeds to eat that one, only to find out that it actually makes people less smart.' (https://en.wikipedia.org/wiki/Unreal_(short_story_collection)