I honestly don't know how to answer your question but I'll try. My memory can be exact and absolute with specific details when it concerns objects or melodies, but hasn't manifested itself that way with written language. I think you've written about a student Lawyer in Barcelona before, but I can't connect "fancy meeting you here" with that. That being said I can't guarantee that it wasn't used there either. I think we have some backtracking to do, any idea where to start looking?