Dirty Dancing
It wasn’t a line, per se, but when the actors started shooting the first dance scenes of Baby and Johnny, Baby couldn’t help but burst out laughing each time he ran his hand down her arm. You can even see her trying to keep it together during the scene.

Dirty Dancing
ADVERTISEMENT
Titanic, Again
Leonardo DiCaprio’s iconic moment of shouting, “I’m the king of the world!”, was actually an improvised line! It goes to show that sometimes the best lines are those not written down on paper.

Titanic Again