These unscripted Glee moments went off book. Our countdown includes choreography mistakes, musical improv, Copacabana flash mob, and more! Whats YOUR favorite unscripted Glee moment? Let us know in the comments!

Watch more great unscripted videos here:
Top 10 Unscripted Sitcom Moments That Were Kept in the Show - https://youtu.be/5wYBRUQ9eMA
Unscripted Moments That Were Kept in The Big Bang Theory - https://youtu.be/byplVJFDfYw
Top 10 Unscripted Parks and Recreation Moments That Were Kept in the Show - https://youtu.be/LUb_2TJE2jM

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