Pick the hottest girl in the pub. Arrange to bump into her. Accuse her of not paying attention to what she's doing and being to caught up in herself. When she tries to argue call her a name or two and walk off ignoring her. In short order she'll follow because she isn't used to this and doesn't understand why you treated her that way when all other men fall at her feet. When she approaches act very unhappy to see her, let her plead her case which invariably will be "you bumped into me" banter back and forth a time or two then act like she might have a point and tell her some BS about how bad your day was etc and that you are sorry you took it out on her. Make it seem heartfelt. She'll then forgive you . Immediately extend your hand and introduce yourself as if you are embarrassed and you are on your way to getting to "know each other". Anyone can feel free to disagree with this but it's tried and true. It's worked many times. The hot ones always let their guard down when they are confused and you don't seem the least bit interested. Of course it doesn't work as well if she's with a bloke. Also, you have to do it correctly. With the right amount of emotions at the proper times. Practice a few times...