Forrest Gump 

Like some of these other films on our list, Forrest Gump has plenty of quotable lines that have made it into regular conversation, most of which were scripted. But there’s a great improvised moment when the protagonist meets his best friend Bubba. 

Bubba introduces himself with, “People call me ‘Bubba.'”  While Tom Hanks’ was supposed to respond with “My name is Forrest Gump,” he instead parroted Bubba and said, “People call me Forrest Gump.”