The line comes from Supernatural, the long-running American television series that premiered in 2005 and follows brothers Sam and Dean Winchester hunting supernatural creatures across America. Dean, the older brother and habitual driver of their black Impala, uses the rule to settle arguments about the car stereo, favouring classic rock on long drives. Fans clipped the moment, shared it in edits and reaction videos, and it became shorthand for car hierarchy and music control, which is why it still appears in road trip content years after the series ended.