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No one knows the Chiefs-Raiders rivalry better than Hall of Fame running back Marcus Allen; he spent 11 seasons with the Raiders and five with the Chiefs.

Appearing on Wednesday’s PFT Live on NBC Sports Radio and NBCSN, the man who played for the L.A. (but not Oakland) Raiders recalled going to Oakland for a game with the Chiefs. Fans were given free admission in exchange for turning in guns.

The only problem? They kept the bullets — and then threw them at the Chiefs players.

But Marcus holds no grudge against Oakland. He said he prefers that the team stay there, with a second choice of returning to Los Angeles over moving to Las Vegas.

For the full interview, which includes Marcus forcing me to sing (if you can call it that) the Kay Jewelers jingle, click the thing in the thing.

And here’s where it gets fun. You can post a video of yourself singing the Kay Jewelers jingle with the #SingforStJudeDonation hashtag, and Kay Jewelers will donate $100 to St. Jude’s Children Research hospital for each video posted. There’s a limit of one video per person, but Kay Jewelers will donate up to $50,000 — so 5,000 of you should do it.

So do it. Trust me; your effort will be no worse than mine.