So while our cat was acting "crazy" this evening tearing from room to room and pouncing on on nothing, my wife and I were laughing at its behaviour. During discussions she mentioned hearing that cats have a chemical in their brains that acts much like LSD. Sure enough, someone on the Snopes forum asked the same question (the thread relates other humorous cat stories but no answer).
So, do cats (normally) have any chemicals in their brains that causes them to "hallucinate"? (or cause this rather erratic behaviour)