What kinds of gestures or behaviors from a guy that he's silently saying, 'Wow, she's so hot'?

Have you ever caught someone acting a certain way that made it obvious they were totally captivated by you?
What are the signs that someone thinks you're 'out of their league'?

Is it the way they keep sneaking glances, how they fumble over their words when you talk to them, or maybe them walking past you repeatedly?
What’s the giveaway?
What kinds of gestures or behaviors from a guy that he's silently saying, 'Wow, she's so hot'?
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