The Princess Bride was a popular book and film on Earth.
When the Atlantis expedition was forced to leave Atlantis in 2006, Lt. Colonel John Sheppard told Dr. Elizabeth Weir that "Life isn't fair. It's just fairer than death". Weir guested the quote was from Oscar Wilde but Sheppard says "The Princess Bride. Good movie." Later, during a mission to retake the city from the Asurans, Dr. Rodney McKay said that Niam was "only mostly dead." (SG1: "The Return, Part 1", "The Return, Part 2")
Later that year, Lucius Lavin suggested that he and Sheppard both wear a cloak in order to appear like a giant which is feared (religiously) by the people. This is a reference to the climax of the film. (SGA: "Irresponsible")