Who Wants to Be a Millionaire is a long-running television quiz format in which contestants answer a ladder of questions for larger cash prizes, and its tensest moments are scored with a slow heartbeat and rising music as the host pauses before confirming an answer. That pause became one of the show's most recognisable trademarks, and the sound has since been clipped, shared and reused online far beyond the studio. Editors now use it as shorthand for suspense itself, dropping it into quizzes, challenges and reaction videos whenever they want an audience to wait anxiously for a result.