-closing a HB in a car next to you at a stop light. Something along this lines;

Get to a stop light and in the car next to you is a HB and she smiles at you. You smile back and hold eye contact for a little bit and than motion her to put down her window. now the question is how would you get her #?

I was thinking you could say, "hey, this is random and kinda awkward but i think your adorable, and since our time is limited, what is your number so we can continue this awesome moment." And if she does give you her number you could always follow up with something along the lines of, "you know I am going to be asking you out, right?"

Tell me what you goes think. Let me know if you have better lines that can be used. I haven't field tested this yet, just wanted to hear some insight.