Commonly known hallucinogens being LSD (acid), Amanita Muscaria (Super Mario Toadstool Mushroom), or even Salvia (Legal).
That which is hallucinogenic does NOT all have the same effect. Some have different side effects and some could make you hallucinate differently. An Amanita Muscaria mushroom (containing Ibotenic Acid/Muscimol) would make you trip differently than any Psilocybin containing mushroom.
Chemistry Teacher - Students, today we are going to learn how to extract and condense LSA into LSD
*the next day*
Chemistry Teacher - Does anyone else see that unicorn in the back of the room?