I'm Rick James bitch, cocaines a hell of a drug.
I've been offered coke several times, it's a fun little thing to take "bumps" of while your being social. I tried ecstasy a couple times, not very exciting unless your tripping hard which I haven't due to needing a proper dosage.
The hardest drug I've done is Heroine, basically smoked it thinking it was hash, after I had tried it I wasn't sure what was going on, took another hit, next thing you know I'm higher than I've ever been in my life (kind of became obvious at that point) and I'm playing GTA4 like I got godmode on. 30 mins later I passed the fuck out. Next day I had dry heaves and a hang over basically, was definately not worth it.
I'd try LSD if given the opportunity and right environment, but yeah I'm afraid to hallucinate in public.