Nah it dosen't work that way, all you gotta do is go to the dance floor and just aproach her, just go near her and dance with her the music will be so loud you won't be able to say anything... This works best on night clubs that only play techno (my favorites). In my particular case, the girls usually approached me (usually when they were too drunk to notice how I look like) or someone introduces me a girl and I'll start talking to her.