Yeah, props to WD, he came up with the Dallas girl opener and he and I ran it a half dozen times in one night.
I used it last night, but it was a little different. There was a decent 2-set, maybe a 7 and an 8.5. The place was mostly empty, and El Fenix and I (and another random guy) had been standing within view, maybe 20 feet away for a few minutes. So it was impossible to be "on the way to the bathroom" or something and "spontaneously notice" and ask for an opinion.
So I walked over, stopped, faced directly toward them, and said "Hey" really loud, to get their attention. "Are y'all from dallas?" One of them says yes. I point to the other one and ask, "how about you?" She says yes also. I say okay and walk back to El Fenix.
I talk to El Fenix and Guy for about 15 seconds, maybe 30, using (i think) more animated gestures and body languge than normal. Then I walk back over to 2-set and explain, "see, my friend is not from here and I'm trying to describe to him the stereotype of the typical Dallas girl. Do you know what I'm talking about? Are you one of those typical Dallas girls?"
Less than a minute later, he comes over. We're in, no problem.
Actually I think in this case they were both "Dallas girls". The smarter, more attractive one denied it. The other one was so dumb, she didn't even know what we were talking about.
One more thing about talking past a girl to get her to open me. The guy doesn't necessarily have to be part of the same group as my target. I've only tried it once on a guy from a different group, but it did work.