This type of opener I’ve searched in order to find if anyone already posted but found none. So here it is…

Well, instead of thinking an opener or preplanning, I asked an HB (rather it was a SHB), “What you expect a random guy to say to you that might instigate your interest on that guy?”
(Note: Take care of your body language. It must seem that you are on your way and you are just asking her, as she was present there. You might have asked it to anyone)
After she replies (the reply will vary), tell her a made up reason like I said, “One of my friends were having trouble talking with girls. So, I decided to boost his confident by let her talk to girls. So, to give him a ‘preplanned line’ for instant success I asked you.”
After that I negged her, “Do you think it will really work??”
She replied, “I guess.”
I told the opener she provide me. Then I asked, “Are you interested in me?”
I’m not discussing further. However it’s a good way to start a conversation. Well, not only we had a good laugh and talked for long but also we number closed.