Ecstacy, molly, or whatever else the faggot kandy kids call it these days. It's ok to try a few times, spaced apart by long periods of time, but it can fuck up your head when abused. Heavy use has been associated with brain lesions. I dunno why anyone would *want* to use it regularly. Subsequent dosages have rapidly diminishing returns and it only takes a day or two for it to have no effect. It also induces the worst fucking hangovers. Not like an alcohol hangover; more like an all-encompassing, soul crushing day long depression and mental fatigue.