The line “I'll be back” from the sci-fi movie The Terminator (1984) became one of cinema’s most recognizable threats, transforming a simple promise into an enduring cultural moment. The Terminator not only invigorated Cameron's career but also solidified Arnold Schwarzenegger's status as a global superstar in both the action and sci-fi genres. In fact, one of the biggest highlights of the film is a three-word catchphrase delivered by Schwarzenegger. Schwarzenegger's portrayal of the cyborg assassin launched him to stardom overnight.

Source: No Film School