Not Medical Advice: The name Fun Guy is a slang term for psychedelic mushrooms and a wordplay on fungi.
Magic Mushrooms via kwout
Psilocybin is the active ingredient in so-called 'magic mushrooms' - which grow wild in the UK and parts of the US, as well as countries such as Mexico and Thailand.
Psilocybin is a psychedelic compound that is produced by a wide range of mushroom species. The more than 200 species of mushrooms that are responsible for the production of psilocybin are collectively known on the streets to recreational drug users as "magic mushrooms".
These psychedelic hallucinogens produce mind-altering effects when they are consumed. According to researchers, hallucinogenic fungi containing psilocybin can change your personality not for a few hours, but for at least a year.
Study leader Roland R. Griffiths, a professor of psychiatry and behavioral sciences at the Johns Hopkins University School of Medicine said that so many of the study participants still exhibited changes after a year the changes were 'likely to be permanent.' Read more at the Daily Mail.
Other names for psilocybin include Little Smoke, Purple Passion and Shrooms.
For more information about psilocybin and its effects, go to Hallucinogens.com.