These big screen stars love to improvise. For this list, well be looking at the best actors who are known for ad-libbing or otherwise deviating from written scripts. Our countdown includes Will Ferrell, Robert Downey Jr., Robin Williams, and more! Whats your favorite example of an actor going off-script? Let us know in the comments!

Watch more great comedy videos here:
Top 20 Comedy Movies of the Century So Far: https://youtu.be/s0gdBeTqql8
Top 21 Comedy Movies of Each Year (2000 - 2020): https://youtu.be/GkgX74P3qeI
Top 20 Scenes Where Actors Couldnt Keep a Straight Face: https://youtu.be/8bYjWOU4KcU

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