Some "Full House" fans apparently missed a brush with greatness – Uncle Jesse himself, John Stamos.

Stamos recently visited the San Francisco home featured in the opening credits of the popular sitcom from the '80s and '90s. But three tourists failed to notice that the star was standing just feet away from them.

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"Boy, these youngsters have 0.0 idea what they're missing. #Fullhousehouse. #TURNAROUND," Stamos wrote in the caption of a photo posted to his Instagram and Twitter accounts Friday.