You walk past her (the girl can do this, too) and say "Excuse me, but did you just touch my ass?" The girl may react violently, or simply ignore it. She may also stare at you as if you're losing your noggin. If she says "No" give her a dimpled grin and say "Damn!". Now, experiment with this simple question, anytime you walk inside a bar and sit beside a lady or a guy. Say "What's wrong with you?" This should definitely be a great way to break the ice, if not your arm. It will probably force the girl to rethink her plans for one night, because she just met a dork looking to get laid.
