How do you show a guy you like him?

I think we can all agree that if a guy likes a girl. She knows it, we are blindingly obvious. We try and talk to you, we try to spend time with you etc etc.

But what do you girls do when you like or have a crush on a guy. I know we can be kinda blind sometimes, but let's be honest, You girls aren't exactly screaming it from the rooftops. So what are some things you do, purposely or accidentally.

Might help us understand you a little better to know what to look for.
How do you show a guy you like him?
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