I would smile, and check my wallet.

It would depend about the country where I would be and about what ethnicity I would consider the person to be. If I would be as tourist in country or area that is well known for all types of scammers the best the person just popping out of nowhere and saying "I love you" would get would be either ignoring or angry stare. Otherwise the person would get polite smile but that's it.

gosh! well i would ask her/him, in wich Tv program am I gonna be?:D

I'm gonna invite her to have a drink with me then let her pay the bills.... he-he-he.. just kidding. honestly, I don't treat such thing seriously but just being a gentleman, I think will just throw a smile at her and say "what is it for?" :)

I would say to him " Are u Okay, sir???"