Mescaline

Peyote will make you shit bricks, when you imagine you're a deer chargin it's lazer

	“	Let me tell you a little something about how I became a famous author...	„
	— Aldous Huxley

	“	Let me tell you a little something about how I became a famous author...	„
	— Hunter S. Thompson

Mescaline is a natural hallucinogen found in several species of cacti, namely Peyote, that will cause you to see reality for what it truly is, more so than LSD or Psilocybin, and probably make you puke out everything you ate for the past week if not digested correctly. Historically, it has been used by Injuns to communicate with various Earth, Buffalo, Fire, Welfare, or whatever the hell other spirits they worship in drum circles behind closed doors at casinos.

Legality

Unless you happen to be a Native American using it for highly religious purposes, Peyote is illegal under US law, but it's not like you'll get caught either. San Pedro and Peruvian Torch on the other hand, while they do not contain as much Mescaline as Peyote (especially the later) and require higher doses, can be bought at your local gardening center, probably in Walmart, and are also easily purchasable online (as in PayPal easy).

Effects

1-2 hours to take effect, have fun waiting
Time breaks and plays games with your head
Reality and colors are warped, generally judging by your subconscious associations with various scenes, locations, objects, etc
Mind becomes increasingly lucid