“Execute Order 66” comes from Star Wars: Episode III – Revenge of the Sith, released in 2005. In the film, Chancellor Palpatine gives the order that turns the clone troopers against the Jedi, making the line one of the most famous betrayal moments in the franchise. Online, it spread through reaction memes, gaming edits and dark humor posts whenever someone wants to frame a decision as a dramatic purge. It is often paired with sudden suspense to heighten the twist.