(in a location where the target is not walking, for example a subway)
you: (after a few minutes of noticing her) hey, can i ask you something?
HB8: (she'll be very surprised, maybe even happy u asked and usally she'll say..) yea
you: WHY ARE YOU SAD?
HB8: (she'll usually say) im not
you: well, with the face ur making... (she's gonna cut you right there...)
HB8: bla..bla..bla (there you go, you just opened succesfully)
if you're wondering, im still an AFC and i rarely overcome AA, this opener worked incredibly well for me... i guess you need to analyze the situation and find the best opener on the spot,
(how i dilivered it) you noticed the
and the and you think that this looks creepy for a girl who sees you as a complete stranger.. but in my situation she was genuinely sad (as lovedrop or mystery said: for any set, you must be the one with higher energy levels) and my asking this sympathicly and with enthusiasm really boosted her up, it might have been the best part of her day 
what followed: i purposly openned only one stop before mine so that awckwardness in conversation would not happen (it certainly would if i opened 5 or even 3 stops earlier...i have NO material!) ... turns out we both had to leave at the same stop and she kept on walking with me (as we talked i applied dhv rules and barely faced her) and i got her number... NOT, but would've if i had a fkn cellphone lol
i know its rly n o t h i n g for you guys but as far as i can think of it's maybe the second or third time that i ever opened with a target (and NOT a person from who i want the time or directions) so im pretty happy i overcame AA this once and i hope itll inspire me for lots in the near future. my goal is to become a pua, plz tell me what you think of the opener and plz give me any advice from ur personal experience... im almost stuck with AA (due to bad voice projection)
thanks