The canonical pick-up line
. Ne, kanojo, ocha shinai?
This is The Oldest One In the Book
. Don't ever try to seriously
use this, it's like asking "What's your sign?
" or something equally inane
However, it is good for a joke, especially if you're a foreigner; nobody will expect you to know this lovely phrase. It'll get a laugh every time. Well, no, I take that back. It'll get a laugh the first time. Then don't ever use it again.