A lot of the best disasters – asteroids, aliens, earthquakes, tsunamis – have already been taken, sometimes twice, as in the embarrassing simultaneous releases of Armageddon/Deep Impact and Volcano/Dante's Peak. So you'll have to be a bit creative. Pick something unusual: what if gravity started going sideways instead of straight down, say?
In a cave underneath Mount Rushmore, the president should introduce the scientist to a crack team dedicated to fixing the problem – which should turn out to include his attractive ex-wife as well as a droll Englishman. The three of them should come up with a plan to stop the disaster – the more unrealistic the better. A good one in this case would be to have someone jump off the Empire State Building like a diving board in order to activate a nuclear weapon that would destroy the moon and thus reset earth's gravity; anything like that, really. Watching a cable news channel as they discuss who could carry out this dangerous mission, the team sees a report from the devastated New York, where the cat burglar is leaping across sideways skyscrapers to save an old grandmother's life. "By Jove," says the Englishman, "I think we've found our man!"
The cat burglar dives. The scene cuts to outer space as the moon is destroyed. The sun tilts back on its axis, and back on earth gravity swings gradually back to its normal direction. Buildings right themselves and stand up straight again. Foreigners in turbans or Eskimo furs cheer and hug in far-off locations. The scientist reaches out for the hand of his ex-wife. And the little orphan boy runs up to his cat burglar dad for a dramatic hug, the Empire State Building back to normal behind them. He didn't die after all!
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