James Cameron told Arnold Schwarzenegger, "Don't tell me how to write," after they argued about "I'll be back" in "The Terminator."

Arnold Schwarzenegger's iconic one-liners include "Get to the chopper!" and "It's not a tumor!" from different movies. 

His most famous line, "I'll be back," originated from the 1984 film "The Terminator." 

Schwarzenegger has repeated this catchphrase in every subsequent "Terminator" movie he has been in. 

In the new Netflix docuseries "Arnold," he and director James Cameron revealed that Schwarzenegger initially didn't like saying the line. 

Schwarzenegger wanted to rework the line into something else during the filming of "The Terminator." 

Despite his initial reluctance, the line became a memorable and iconic part of his character. 

The docuseries provides insight into the behind-the-scenes discussions and decisions regarding the famous catchphrase. 

Schwarzenegger's hesitations highlight the creative process and the evolution of a line that became synonymous with his career.