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LSD (acid): powerful hallucinogen that causes mind-bending visions, sometimes pleasant, other times not.
MAO inhibitors: Monoamine oxidase is an enzyme that metabolizes neurochemicals in the brain; MAO inhibitors are antidepressants that prevent the enzyme's activity, allowing neurochemicals to continue working.
Special K (ketamine): animal tranquilizer (used by veterinarians) that doctors classify as a "disassociative anesthetic," since your mind feels detached from your body. Depending on the dose, ketamine induces everything from pleasant weightlessness to a full-fledged out-of-body or near-death experience.
2CB: Mild psychedelic sometimes sold as Ecstasy.