If some chick is clearly trying to qualify herself to you, or transparently DHVing, or even just struggling for your attention, you can neg-qualify her in the following manner, playfully: "It's okay, you don't have to (do that/try hard/whatever) to get my attention. See?" Throw an arm around her, kinohug her. The first time a guy did this to me, it hit me like a -bomb- of insta-hotness. By doing this, you simultaneously A) drop her value relative to yours, B) grant her attention from a position of power, and C) show you know the score.