"If you like a guy, show your interest in the usual ways and let him reciprocate or not, but don't start acting all Rules-y if it's not you. I mean, you don't have to introduce yourself by belching your name, but if he belches and you comment, "Nice reverb,"and then he gives you The Disapproving Eyebrow, he's not the guy. The guy who's all, "Oh, thanks -- I can't usually torque a Pepsi too well but I got lucky with that one"? He's the guy. In fact, step off that guy -- he's mine."