For me, openers must be a way to break the ice and give you an opportunity to engage an interesting routine (that's why I don't like direct openers, even in clubs) and win the girl and the whole group's attention.
Developed this one after two kiss and number closed in a group went through this kind of conversation (field tested too):
pua: "curiosity... a friend of mine, XXX (name here) who is about to arrive, thinks most women are complicated. So, if tell him to read Twilight, will this help he understand girls better?"
hb: "no... it's kid stuff / yes (bla bla bla)"
pua [case the answer was no]: "yeah, I've thought about telling him this. I've also heard about 50 shades of gray. Lot of girls love this book and most guys disdain." (you don't need to ask a question here, this book catches girls interest by itself, it is just like if a girl starts talking to us about the game).
pua [case answer is yes]: "interesting... thought it was more teenage history (slight neg here). I've also heard about 50 shades of gray. Lot of girls love this book and most guys disdain."
hb: she will talk about the book (even if she didn't read).
what i like in this one is that it gives lots of room for negs, push pull, cold reading games. don't be afraid of disagreeing.
ohh, almost forgot... she will very likely not remember that you said a friend of you was arriving
. and if she does, you can promptly answer with: "nah, I played you. I don't agree with lots of your opinions but they are interesting... i'm learning a lot" (this will probably get her curious, however, i've never need to be here, so, I'm just speculating.if someone uses this opener, just post here. I'll be glad to know!
ps: you don't need to read the book, but if you read a 50 shades of gray summary on the web, you will be able to engage a better conversation, and counter attack her arguments.