16. The Hug – Good Will Hunting (1997)

In Good Will Hunting, the scene where Sean (Robin Williams) told Will (Matt Damon), "It's not your fault" was improvised. Williams repeated the line several times, and it brought out a very emotional response from an unsuspecting Damon. Damon's tears as well as his embracing hug weren't in the script, but they were natural as the scene unfolded. This unscripted moment has really highlighted the deep bond between the two characters and has been one of the most memorable parts of the film, showing how vulnerability can be powerful and Williams' ability to create deeply moving, authentic performances.
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