For all of those knocking coke, I'd suggest (only for the more advanced users, it can seriously fuck you up) mainlining it. Honestly, I had tried snorting coke before, and although enjoyed the buzz, I didn't find it worth the money. Mainlining coke is completely different, it hits you like a ton of bricks and is total joyride, albeit highly dangerous. A speedball is the closest thing to heaven one can hope to find.

Oh, and for the record, the best drug is probably heroin, with peyote coming in a close second, although I don't recommend either to you. I've been struggling in and out of a junk addiction for awhile now, and try my best to keep the beast at bay, only for those with the willpower to handle it. On mushrooms, I highly doubt your friend actually saw Bob Marley, at the most probably the blending of objects or kaleidescope patterns. That said, mushrooms are one of my favorite drugs, much preferrable to acid, they can be used effectively for mind enhancement or spiritual guidance. However, if you're doing them to just get "fucked up," just don't; not only are you disrespecting the drug, but that runs the risk for a bad trip. Enjoy.