I just finished watching
Superman IV: The Quest for Peace, the final Christopher Reeve Superman movie ever made.
The last line of the movie is delivered by Christopher Reeve. Superman has just dropped Lex Luthor off at prison. Lex asks him, "Is the world going to be vaporized?"
Superman responds, "No Luthor, it's as it always was - on the brink, with good fighting evil. See you in twenty."
Although
Superman IV was released in 1987, all of the photgraphy was begun and finished in 1986 - twenty years before
Superman Returns hit the screens and Luthor finally got out of prison.
Looks like Superman's prediction was spot-on.