Because a few months ago you were talking about how big you think his cock is, and now you've happened to have a run-in with him in the bathroom and actually seen it. If you had never commented on this thread before and just now came and posted that you were pretty sure you saw him and peed next to him, I'd be more inclined to maybe believe it. I'm not saying you didn't see someone who maybe looked a bit like him, or peed next to some random stranger, but I doubt it was him.