The worst has to be "I lost my number, can I have yours?" or maybe "Did it hurt when you fell from heaven?" another is "Can I buy you a drink or should I just give you the money?".
These are the most insulting to me. Oh and that love at first sight thing is really superficial because that's like saying "Babe, I fell in love with you because you are really pretty", not knowing this 'babe' is an axe murderer. People, think.