What's the most outrageous prediction for the future made in a sci-fi film?

Nuclear war will come in 1964 – said 1960's The Time Machine. 2010 will be the year alien life will be discovered in our solar system, said 2010: The Year We Make Contact. That one has four months still to make bad on its promise, but what are the wackiest visions seen within sci-fi's crystal ball?