So, Losties, did you catch Hurley's reference to Xanadu in tonight's episode (don't worry, no spoilers)? I'm sure the writers just threw it in for fun because this movie is hilariously horrible.
I haven't seen it, but I learned about it from Entertainment Weekly when the Broadway musical was in production a few months ago. Apparently, it was a flop of a movie hoping to capitalize on Olivia Newton-John's popularity from Grease. Basically, Olivia Newton-John is a Greek muse who inspires some dude to open a roller disco. And also, they fall in love.
The music and the badness of the movie was enough to establish a pretty strong cult following. And now, through the magic of YouTube, we can see what I only assume is the movie in a nutshell, the final scene.
I'd say this video clip is eight minutes of your life well-wasted. Enjoy.