Let this be a warning to anybody thinking about handing Marshawn Lynch an item to autograph — you may never get it back.

Exiting ringside of Oracle Arena in his Oakland hometown, where he was on hand to watch Andre Ward remain undefeated Saturday night, Lynch was handed a hat by a fan to sign. Without flinching, the recently-retired NFL running back snatched the hat and, instead of signing it, just plopped into onto his head and walked away with it. Ha!

Beastmode for real! Most fans at Oracle laughed, while one yelled, "He jacked your hat! What an a**hole! He took your hat. Wow!"

Seeing is believing. 

This is classic Marshawn Lynch. Especially now that he's retired, Beastmode really has zero chill. He's about that action, boss.

Dude who lost his hat now knows just how much Beastmode lives by that mantra.

By the way, Lynch was far from the only Bay Area representer in the house Saturday night to support Cali's Ward.

Beastmode was joined by the likes of Michael B. Jordan, former San Francisco 49ers running back Frank Gore, Sway Calloway, Stephen Curry and Draymond Green from the defending NBA champion Golden State Warriors.

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(Photo: Otto Greule Jr/Getty Images)