Biologist Colin Domnauer is reopening an old case that Chinese health officials seem to have stopped caring about. Every summer, residents of the Yunnan province check into hospitals with complaints that they’re hallucinating tiny elflike people. They would see the little dudes marching under their doors, scaling their walls, and clinging to their furniture. Health officials used to care about it. They looked into it some years back and found that the cause was Lanmaoa asiatica , a mushroom that’s been eaten in Yunnan for years. It’s supposedly got a rich, umami flavor, and locals know that you have to cook it thoroughly, not to bring out that flavor, but to kill off the mushroom’s hallucinogenic properties. Videos by VICE Scientists call these “lilliputian hallucinations,” a rare phenomenon involving miniature human or fantasy figures. If you’ve seen the Adult Swim show Common Side Effects , you may be familiar with the surreal trippiness of this apparently very real form of mushroom-based hallucination.…