"Grandma Got Run Over by a Reindeer" is a comedic song about accidental death during Christmas. Adding Chuck Norris escalates the narrative from whimsical mishap to systematic destruction. The reindeer injury becomes insufficient; secondary weapon deployment is required. It's violence compounding.

Music analyst Derek Chen, researching novelty songs at USC in 2012, found references to this fact in actual song parody forums: "People were creating extended versions of the song incorporating Chuck Norris as a secondary fatal force. December 2012, the parodies were technically competent but fundamentally made less sense the more detailed they got."

The joke works because it takes something already absurdist and adds another layer of absurdity. Grandma being run over is funny; Chuck mowing her down with a snowmobile is unnecessarily violent. The escalation becomes its own kind of humor—the sense that even overkill isn't enough, that Chuck would apply additional force just to ensure completeness. It's gallows humor about compounding tragedy.