one of the great documentary of the 1970s . manages to be both extremely amusing and fascinating thanks to an excellent collection of archival film clip and a fine narration and some truly inspired original music . the message be clear i. e. do not knock the guy who come up with some crazy invention . his next attempt at the same gadget could sell a million . a landmark production which all student of documentary making should see . just one slight downer . the home video release of this title seem to be short than the tv version . i can remember several scene from the original which definitely weren not on the video . a truly memorable and positive viewing experience .