One time Clark was over as the manor for something not heroing related, likely just to check up on Bruce or whatever. Lil Robin, age 7, was there too, constantly starring at him, trying to figure out where the hell she knows that face from. In a moment of being alone with Clark, lil Robin innocently asked Clark if he could take off his glasses for a second. Not thinking anything of it, Clark complied, earning a little "Oh" from the little girl.
"What? Am I not looking like you think I would?" Clark asks amused, putting his glasses back on.
"It's not that," lil Robin replies, "I just realised that you're Superman."
Clark's face falls as he stares at the child.
"You have the same face like Superman. And even if you would be his twin, that would mean that you have the same powers as him." Robin replies innocently.
Clark just stares at the child in disbelief.
"Can I get an autograph? I collect them."
"Superman doesn't give autographs."
"Neither do any of the bats I think. But I still got one from Nightwing."
Clark squints at Robin, who doesn't seem to be at all bothered or intimidated. Finally, the unmasked hero sighs.
"Fine, give me some paper and a pen."
Robin lights up and runs out of the room, just to return a little later with a permanent marker and a picture of superman. Clark sighs, takes both and signs the picture, although a bit unwilling. After he's done, Robin takes the signed picture and the pen back and smiles at him.
"Thank you uncle Clark, you are the best!" Robin says before running off again.