Movies are forever. Movie scripts, on the other hand, are hardly set in stone. Throughout the history of cinema, some of the best, most iconic lines that ever existed were created on the spot, delivered accidentally, or made up by the inventive minds of Hollywood actors.

There’s no shortage of iconic improvised lines in this compilation, from Orson Welles’ The Third Man to Walt Disney’s Frozen! And some of these are so good, clever, and memorable that it’s almost unbelievable to think they were never part of plan A. Has your favorite film made it to the list?

“She Talks in Her Sleep” (Indiana Jones and the Last Crusade)

In the late ’80s, Indiana Jones movies were the finest example of an adventure/action blockbuster series. But when the producers decided to add Sean Connery to the mix (cast as Jones’s father), the 1989 classic Indiana Jones and the Last Crusade gained a whole new momentum.

But who could’ve guessed that one of Connery’s most memorable lines was unscripted? When asked about how he knew Elsa Schneider was a Nazi, he replied by saying, “She talks in her sleep.” The line was received with an all-too-honest smile by Harrison Ford, who wasn’t ready for the off-script moment, and a big thumbs up from director Steven Spielberg, who loved it instantly.