Guys, I appreciate your input. Have learned something already. It's nice to see a high-school-related tips and strategies.
Anyways, today I'm sharing my favorite technique, easy to use, but shamefully overlooked most of the time.
The LOOK.
I love it. It is great, it is fast, it is efficient, it is non-verbal so you don't have to think some witty lines, it is usable anywhere, anytime, as a reaction to anything.
If someone says something stupid to put you down if front of other people, you give him a second-and-half long "you-are-so-immature-and-stupid" or "are-you-done" look. He shuts up, and whole crowd knows that you don't acknowledge this guy, so he loses respect.
If a girl does something stupid, you bust her balls by doing the "look-what-a-mess-you-did" look with a sly smile.
If you want to spark a conversation, or build it up, give a person a look full of interest and curiosity. Like a child, asking his/hers mother why the sky is blue (btw, my explanation was that it's of all that water that evaporates

).
Nothing creates sexual tension - and thus attraction - better than "I-know-you-want-me-and-I-want-you-right-here-too" look. Or, earlier in a conversation, the "you-could-be-interesting-to-get-to-know-better" look.
Etcetcetc. You can say whatever you want, effectively bypassing her bitch-shield most of the times. Because the look is just between her and you.
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Oh and try to do it with minimal face expressions. Don't exaggerate, try to keep your expression low. However, don't go into the other extreme either - be sure she can understand what mean by that look. After all, eyes themselves don't change; it's your face that does.
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Plus; the look is most effective when done silently. However, you can talk and give the look at the same time, if you want to engage her critical consciousness and let the look "talk" to unconscious.
OK, so that's it.
Share your thoughts!
Carpe Diem.