Lincoln Week Outtake: Mark VI Grenade?

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I’ve passed this ’80-83 Mark VI a zillion times walking the dog. It does move from time to time and it’s kept clean, so it’s a genuine CC. Not my style, but a year or so ago, one of those hand grenade decals showed up on its flank. What’s the deal with that decal anyway, does it mean anything other than ‘look out I’m explosive’? Usually seen on a kid’s pickup, never seen on a car with opera windows. Your reactions?