This is one of the most awesome things I do when I'm out. Pauses.

A girl asking you a question? Just look at her for 5 seconds, give her the "I will fuck you so hard look" with a smirk on your face and then answer her question like nothing happened. As well, when you're talking to her, make a pause for a couple of seconds at some point and look her in the eye, make your point and then carry on talking. It is so awesome. Lastly, when she makes a point and is finished, just nod, take a sip from your drink and look at her. It will make her feel obliged to continue the conversation and validate herself to you.

What it does it shows the girl that you're in control and that you are comfortable with you and the environment. :)