This is one more original from me.

Some Context:
I developed this by accident today-but it turned out to be really effective. I was sitting in physics class, hb 8 is behind me. As just a nice gesture, i offered some of my friends around us some gum, and lastly, figured i'd offer her a piece too because i felt bad that I'd been robbing her of gum for the past 2 months haha. But I was going to make it playful, and suddenly this routine popped into my head. Applicable to almost anything small enough and effective anywhere.

Routine:

Turn to HB. Hold (in this case, gum) the piece of gum in one hand, making sure that its partially sticking out so that its obviously noticeable. Then say, like you're talking to a little kid, "okay-which hand is it in?"
she'll give you a look and giggle or something of that sort.
here's the great part about this: either response she can make will let you neg her. its gentle and playful too, if delivered well.
-if she picks the hand with the gum in it, with a "duh!" expression, then say "wow! you're way smarter than I thought! awesome! ahah."

Nice! Sounds like it could work pretty well. If you do this to some random girl though expect a weird look in return though lol.

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ahaha yea shoot-totally forgot to mention! building rapport is pretty helpful here too. Like PUAmonster just said.