picked up a girl recently by asking if I should return my espresso martini due to it having four beans rather then three. Told a bunch of guys at my table thats what I was going to do, they all laughed and said it was lame. I gave the old "watch this" and sure enough it did the job.
Its all about delivery and knowing if it doesnt work the next one will. Asking her why you get rejected is auto fail. IF they reject, make a joke of it laugh and move one.
Its a numbers game where once you have done enough the rejections are not even rejections rather lessons to impove your game.