MDMA for me personally. Two good pills, pure euphoria. For some reason the empathy was lacking that time (cut in some strange manner?), and it was really pretty much a pure euphoria-based experience. Can't really remember what it was like, haven't done more than one pill since then (new year's eve), and the recent pills probably haven't been as good. I think I'm about due for another good time like that, maybe I'll kick it up a notch in some way.
Scares me to think about how much I'd love stuff like heroin or meth, ha.