Capablanca played an casual game with an amateur one June evening back in 1918 which ended with a mighty fine tactic. The game has become rather famous, and infamous.
I would suggest starting by reading the original NY Evening Post article, which is included in full below (thanks to Old Fulton).
Then read Winter’s page on the game: http://www.chesshistory.com/winter/extra/capablancafonaroff.html
And, of course, a visit to <CG>’s version of the game is always recommended, both for game and kibitzing: