From Wikipedia: In 1909, Mark Twain is quoted as saying:

I came in with Halley’s Comet in 1835. It is coming again next year, and I expect to go out with it. It will be the greatest disappointment of my life if I don’t go out with Halley’s Comet. The Almighty has said, no doubt: ‘Now here are these two unaccountable freaks; they came in together, they must go out together.’

His prediction was accurate – Twain died of a heart attack on April 21, 1910, in Redding, Connecticut, one day after the comet’s closest approach to Earth.

[Via Reddit]