Have mercy: Uncle Jesse himself returned to his former San Francisco stomping grounds...and was completely ignored by fans hoping to get a glimpse of his former television home.

Full House." There were several other people in the picture, too -- but they couldn't tear themselves away from gawking at the building long enough to realize that Stamos was standing right next to them.

Boy, these youngsters have 0.0 idea what they're missing. #Fullhousehouse. #TURNAROUND.

A photo posted by John Stamos (@johnstamos) on

"Boy, these youngsters have 0.0 idea what they're missing," Stamos wrote of the unsuspecting tourists, who are probably kicking themselves now for not noticing Uncle Jesse.

Let that be a lesson to curious "Full House" fans: If you're planning on visiting San Fran to scope out the row houses, make sure you scan the sidewalks, too.

[via: John Stamos]

Photo credit: Getty Images