Here's one for ya, it takes some balls to pull off but it works great during the day.
(HB reading a book or studying or something. Walk up slowly and deliberately...
PUA: Hi... (stare at her, wait to get her attention)
HB: Hi (polite)
PUA: So, I noticed you checking out my butt over there, and just so you know I am not just a piece of meat. I have feelings, man, feelings. (you have to be obviously joking to pull this off. If you're nervous it won't work.)
HB: (she will laugh here and try to gather herself)
PUA: Look at you, all shy! It's alright, I'm just a sexy man. OK, let's hear your best flirting right now... and GO! (at this point, sit next to her, lock in.)
ANd then you're good to go. You can bust on her attempt to flirt with you from here, or bust on her for being dorky, and then go on to a story or something.
Thought I'd share that nugget. All the best, guys.