Terrence McKenna lecture in early 1990's. http://video.google.com/videoplay?docid=-1829717950811836994&q=terrence+mckenna http://video.google.com/videoplay?docid=-3721378281014589551&q=terrence+mckenna This is a great lecture where McKenna breaks down his theories on mankind's use of Mushrooms...the more you listen to McKenna, the more right on you realize this guy is.