One of the films playing at next year's Sundance Film Festival is Nowhere Boy, Sam Taylor Wood's account of John Lennon's early days and childhood -- how his Aunt Mimi (Kristin Scott Thomas) raised him, how he met Paul McCartney, and how they then formed The Quarrymen. It's an adaptation of Lennon's sister's memoir (The Private John Lennon: The Untold Story from His Sister) and it was adapted by Matt Greenhalgh, the scribe who wrote the bang-on, excellent account of Joy Division -- Control.

Over at Empire, you can check out a clip from the film, where Thomas Sangster's Paul McCartney stops by to teach John (Aaron Johnson) how to play the guitar. After learning some chords, Lennon starts singing and playing "Blue Moon" before the stern Mimi promptly kicks them out of the house. Oh, if only she knew at that moment who and what he would become!

It's a great, surreal clip -- after all of the accomplishments of those two men, it's hard to imagine that there was a time when Lennon was learning, clumsily, squeezing his way through simple chords. These are the same fingers that later came to "Come Together," "Norwegian Wood," and of course, "Imagine."

Since this clip is all about the burgeoning collaboration between two iconic figures ... what are your favorite Lennon/McCartney songs? And, as an added perk, the trailer is after the jump.