Famous Movie Moments That Were Improvised On the Spot

The Spinal Tap

"There's a fine line between clever and stupid" is the takeaway from this metal band movie. Apparently, this movie had so many clever improvisations that the three main actors got writing credits for all their help to the final product. The film was directed by Rob Reiner and was written by Christopher Guest, Rob Reiner, Harry Shearer, and Michael McKean...

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Post originally appeared on Inside Mystery.