Based on the book by William Goldman, The Princess Bride was released in theaters in the US on 25 September 1987. While it was only a modest success at the box office (making about double its $16 million budget), it was critically acclaimed at the time. In the years since, the film has become a cult classic and fondly remembered.
This is likely due to two things: it's a simple, familiar story, told with fantastic dialogue. The Princess Bride tells the story of the true love between Westley and Buttercup, which is tragically cut short when Westley is killed by pirates. Five years later, Buttercup finally agrees to marry Prince Humperdinck, but shortly before her wedding she's kidnapped. Her kidnappers are pursued by a mysterious man in black who has his own reasons for pursuing Buttercup.
If you've never seen the movie, I highly recommend it; aside from the goofy R.O.U.S.'s, it all holds up very well. If you have seen it, why not join the fanlisting?
In 2014, Cary Elwes, who played Westley, released a memoir of his experiences filming The Princess Bride. If you're a fan of the movie, I highly recommend the book, As You Wish: Inconceivable Tales from the Making of The Princess Bride; it's full of stories of how the movie came to be from the cast and crew.