6. 'Mrs. Robinson'
Mike Nichols was nearly finished with The Graduate when he told Simon and Garfunkel that he'd love to include just one more of their songs, even though the movie was already full of the duo's music. Art casually suggested they show him "Mrs. Robinson," causing Nichols to jump to his feet. "You have a song called 'Mrs. Robinson?'" he asked. "And you didn't tell me?"
Turns out, Paul Simon had written a tune called "Mrs. Roosevelt." It's about Eleanor Roosevelt and the passing of a more innocent era, thus the line, "Where have you gone, Joe DiMaggio?" The lyrics have absolutely nothing to do with the movie, but they were happy to change the title to "Mrs. Robinson." They had little idea it would become a smash.