Perhaps you have thought that you will never need to see Xanadu. Maybe you don't like Olivia Newton John, or roller skates, or ELO, or shiny things, or muses. That is fine. But don't let yourself go through life without seeing the very best fashion makeover musical montage sequence ever committed to film. Featuring Gene Kelly and what I like to call the "Xanadu wipe."
[Also, extremely disturbing cat shirt about two minutes in. Don't say I didn't warn you.]