Doubt it's LSD. It can make you do weird things, but I've never heard it make someone that violent. LSD has long been a scapegoat in the states and the focal point of many an urban legend.
Funny someone mentioned PCP. Was watching 'Walk Hard' the other day with a friend and at the time Dewey Cox flips out on his PCP trip I turn to my friend and say, 'you know, I've never heard someone say, or read a story of someone talking about a really great PCP trip. All I've ever heard are stories of people going berserk. I've heard 'good' things about pretty much every other substance but I've never heard of someone talking up the awesomeness of PCP.' Haha. So that's a possibility I guess. But I still don't know.
I think, like someone already mentioned, it may be a case of someone being OFF their meds. Like that sad case in Canada on the greyhound.
