I have great difficulty and often decide against approaching strange people who I find attractive at first glance, often because I have no idea what to say other than 'hello I find you attractive please have my baby', or if I discovered a decent generic introductory greeting I'd be met with a holier than thou attitude or an awkward politeness that will lead nowhere. But then again I'm not convinced that it's reasonable for a person to enter an establishment and interrupt a waitress on the job because you saw her through the window and thought she was cute. Where is the happy middle here?