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The whole sequence in which Christopher Reeve turns psycho and ultimately splits into two personas, having a big fight with himself, is the only reason the movie is worth seeing, and most people fail to acknowledge that Reeve actually did some truly good acting here, good enough so that the "bad Superman" is convincing and somewhat scary -- especially the scene where he is sitting in a bar, unkempt and unshaven, breaking holes in a mirror behind the bar while flicking peanuts at it (never mind that alcohol is not supposed to have any effect on Superman).