Guy: Hey, are my hands cold? Girl: Why? (Guy reaching out and touching girl's cheek): Because your face is really hot!
Pick up a pack of sugar that actually says, "sugar" on it and say, "You dropped your nametag!".
Guy: Do you have room in your life for another friend? Girl: Sure. Guy: Wait, I have a better idea, what about a best friend? Girl: Ok. Guy: Wait, I have an even BETTER idea. How about a boyfriend?
May I borrow your phone? (Why?) I want to call your mother and thank her for bringing you into this world.