there is a fish that when eaten causes severe hallucinations lasting up to 36 hours. It was a party drug during the Roman Empire!
Sarpa salpa, known commonly as the Salema porgy, is a species of sea bream, recognisable by the golden stripes that run down the length of its body, and which can cause hallucinations when eaten.
Sarpa salpa was reportedly consumed as a recreational drug during the time of the Roman Empire. The fish became widely known for its psychoactivity following widely publicized articles in 2006, when two men ingested it at a Mediterranean restaurant and began to experience many auditory and visual hallucinogenic effects. These hallucinations, described as frightening, were reported to have occurred minutes after the fish was ingested and had a total duration of 36 hours.
Source: Unbelievable Facts