Any advice for when you are say on a train/bus and there's a girl just sitting their staring down listening to music and looks like they don't want to be disturbed... it alway seems to be like

"hi" no response "HI" pulls off headphones "I'm sorry, what?"

I mean it seems pretty awkward unless you continue with something like i don't know "Jeez, you must be pretty deaf, what if there was a fire or something, I wouldn't be able to save you!"

Preferably not the advice "Dude there's thousands of chicks, just go for the ones who are more approachable then"