Magic mushrooms, an informal group of fungi that contain the naturally occurring psychedelic substance psilocybin, are known for inducing powerful hallucinations. As the BBC reports, the mushroom, Lanmaoa asiatica, can cause you to see countless tiny people everywhere you look. Donmauer has also determined that the L. asiatica mushrooms do not contain psilocybin, the substance that gives magic mushrooms their hallucinogenic qualities. The “perception of little people is very reliably and repeatedly reported,” Donmauer told the BBC. More on magic mushrooms: Evidence Grows That Tripping on Shrooms Might Increase Your Lifespan