"I'd let you see my muggle ID, but it seems to be missing." He had looked for it last night, after he and Ginny had left the station. It, along with his other personal possessions, was missing.
"How the feck would I know that I met you on the day I was born? What normal person remembers that? Not to mention the fact that I assumed I met you the day I was born, seeing as you are my godfather." Harry sighed and shook his head, "I was talking about the time we re-met when I was older. I was thirteen. I looked pretty similar to this, only... smaller, and not as hairy."
He didn't mention that he was on the lam for blowing up his Aunt the first time Sirius saw him, and that he was saving his best friend the first time Harry saw Sirius.