Most mornings, 18-month-old Cooper sits on the curb outside his California home — pajamas on, snack in hand, dad by his side. And thousands of TikTok fans can’t look away.

A series of mega-viral social media videos called “Coop on a Stoop” is taking the world by storm, documenting the daily ritual of father-son duo Chris and Cooper O’Brien.

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“People are absolutely just enthralled with it for whatever reason,” says O'Brien, who started posting videos of Cooper for his friends and family just a few months ago.

“I had less than a thousand followers when I first posted it, and people just fell in love with it, so I figured, why not do it the next day?” says O'Brien.

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