Tried this at a grocery store once.
Went through the check-out, noticed the girl was pretty cute.
She asked "Did you find everything you were looking for today?"
looked directly at her, smiled, and said "yes"
She rang up the items, and did the obligatory "is that everything?"
"no, actually...I seem to be missing your number."
She smiled and laughed..but i didnt get the number lol.