"You have one of me? Do you not... remember either?"

He stares at him, at the picture, reads the name.

"Rodney McKay."

Saying it... does something. Brings something. Not memories but flashes, ideas, a sense of self. Like slipping into a warm, comfortable hoodie. It just feels good.

"I think that's my name. No, I'm sure that's my name! And yours is John. John Sheppard."

He leans forward, peeking at the picture.

"Hey, that's the same location!"

He finally manages to retrieve the picture and holds it out for John in turn.

"See? The background is the same! Maybe we live together."

That's great information? Already? He just found John Sheppard and he already feels like he finds out stuff!