When Harry Met Sally
As far as romcoms go, Rob Reiner made a cult classic with When Harry Met Sally, no question about it. In one scene, Harry (Billy Crystal) tells Sally (Meg Ryan) the following, “I would be proud to partake of your pecan pie.” Turns out that line was not part of Nora Ephron’s original script. However, Meg Ryan cracked up and actually, director Reiner love the improvisation too.

When Harry Met Sally
The Dark Knight
The late and amazing actor Heath Ledger practiced method acting for preparation to play the Joker in The Dark Knight. Now, this one is a bit different than our others. Ledger didn’t exactly improvise a line, it was more of a moment. It came when he heard about Commissioner Gordon (Gary Oldman) getting promoted. At that moment, Ledger began a slow and sarcastic clap all on his own accord! Wow, what a legend!

The Dark Knight