Everyone repeat after me:
Canned openings don't work.
Louder!
Canned openings don't work.
That's better. Now, not only that--I trust I made the point clear?--you missed the whole point of the approach, which is to be interesting enough for her to want to talk to you. If a girl walks up to you and starts telling about how in the fifth season of Sex and the City the redhead hooks up with this guy and blah blah blah, are you gonna stand around and talk to her? Well, you might, but you'll be thinking "holy crap she is so boring!"
What's important in real life--I'm in College--is even more important in high school. High school girls are the dumbest thing ever, so unless you're actually somewhat interesting, you'll get next-ed faster than you can say "dumb."
Also, Rejected123 (change your username, that's just a negative attitude), while I agree going up to her is the most important part, you have to have something to say, or be able to come up with random stuff to say. Having an idea of what to open with is important, but it shouldn't be a canned opener.
My unsollicited advice? Just notice something about the girl, the situation, or whatever, and when you walk up and say "hi" to her, just comment on it. Make her laugh--not by telling jokes, but just by being witty. Be ****y, but don't be a jerk. Start by just showing you're not a creep with no life by commenting on whatever's around (including the girl), and then move on to having a "deeper" conversation. And by deeper conversation, I don't mean you should start discussing the fine points of the third law of thermodynamics, but just something beyond "I really like the band tonight" or "can you believe that guy over there with the pink and brown shirt?"
Now remember, kids,
Canned openings don't work.