If you ask a girl a question in public; i.e. 'Do you know where the library is?' 99.9% of the time the girl will tell you where it is and you have nothing to worry about. While she's telling you you've also bought your self at least 10 seconds with her.
At this point you could throw in a few DHVs; i.e. 'The reason I ask is my mom is really bad at cooking so I thought for her birthday I'd get her a cook book'*
[Girl Laughs]
Once you've got the girl laughing you've won her over; use one of your own routines on her or ask her to come find the bookstore/library with you and tell her a DHV story on the way.
Basically mate, if you always open with a topical opener thats in context for the environment she will never let you down because it's just not socially acceptable to do that!
*Credit where it's due I found the basis for this routine online a few weeks ago; I can't remember where but it's worked for me
