Robot Wars is a British television robot combat series that first aired in 1998, in which teams of builders pitted their homemade machines against each other in an arena. Each battle began with the presenter counting down from three before shouting activate, a ritual that became one of the show's most recognisable moments. Clips of that countdown have since circulated online as a shorthand for starting a contest, and creators reuse the sound to borrow its competitive energy without needing any footage from the programme itself.