this man knows whats up. essentially, its really high percentage alcohol, which is distilled in wormwood, which is poisonous to humans, whereas other alcohols are distilled in non-poisonous substances. thats why you have all the stuff about tripping and whatnot.
i have never personally tried it, but most of the crazy stuff just happens because its insanely strong alcohol, so people just get super fucked. also, correct me if im wrong, but it was recently legalized in the us. not sure about that one though...