On Friday, he visited the fictional home that was depicted in the show open for his hit '80s TV show.
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A friend snapped a photo of him wearing a black outfit, sunglasses, and a hat in front of the house on Broderick Street. Fans were visiting, but they had no idea that "Uncle Jesse" was right there.
In an Instagram post he wrote: "Boy, these youngsters have no idea what they're missing. #Fullhousehouse. #TURNAROUND.