Make her laugh -- hard.

That's a good sign that there is an interest.  I'm a geek too, and
I have problems in this area, but I think everyone does.  If she goes
out of her way to see you, or just to say hi then that's good too, but
again,  if you can make her laugh effortlessly than that's
a better sign.

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WyldWynd: I guess we've had different personal experiences. In my experiece, most of the time, the cliche is true.