Hallucigenia is a genus of Cambrian xenusiids known from articulated fossils in Burgess Shale-type deposits in Canada and China, and from isolated spines around the world. The generic name reflects the type species' unusual appearance and eccentric history of study; when it was erected as a genus, H. sparsa was reconstructed upside down and back to front. Hallucigenia is now recognized as a "lobopodian worm". It is considered by some to represent an early ancestor of the living velvet worms, although other researchers favour a relationship closer to arthropods.
Normally a drug or plant, causes the brain to faze out of normal thinking patterns, therefore the user hallucinates. It can be dangerous if taken in large quantities.
It also effects the users emotional patterns making the user laugh or cry more easily.