The Texas Chainsaw Massacre is a 1974 American horror film centred on Leatherface, a masked killer who uses a chainsaw as his signature weapon. The sound of that saw became one of horror cinema's most recognisable audio cues, instantly signalling danger, pursuit and slasher-movie dread. As clips and edits spread online, the revving chainsaw moved beyond the film itself into Halloween compilations, reaction videos and short-form horror content, where it now works as shorthand for a killer about to strike.