May I borrow your phone? (Why?) I want to call your mother and thank her for bringing you into this world.
I found this [lace glove, rosary, etc.] on the floor at the club last night, is it yours? Well, if it's not, I'd like to give it to you anyway.
Drop down in front of him/her and if they ask you whats wrong say "I'm sorry but my heart stopped when I saw you and i just fell for you".