"The secret of the castle ghosts has been solved! In Great Britain, which is rich in castles, microbiologists investigated moist, mildewed, and moldy cellars, in which thrive tiny little fungi with psychoactive effects. Breathing in their spores induces hallucinations--- in other words, people get 'high' and believe that they are seeing things that in actuality do not exist."
------------Franz auf der Maur (1996)
Or do they???