What are some signs that a guy is interested in you, even if you both have never talked to each other?

Anonymous
I have a big crush on this guy. He looks at me a lot, before school when we stand around outside, when we pass each other in the hall, and in class. We looked at each other, but I always cut off the eye contact because I was way too shy to look back at him for very long. Sure enough now we sit next to each other in class. I don't look at him any more because it would be pretty obvious and I don't want to come off as being creepy, lol. He acts up in class a lot now, and he makes me laugh so much, so I like him for more than the fact I think he is cute, although my friends think he is ugly. Back to the subject I think he may not have approached me yet because of social stigma (he is popular, me not so much), I am not hot like teen guys like, and I am not within the norm. I don't even think I am attractive. Could eye contact be a sign that he is interested? What could be some other signs?
What are some signs that a guy is interested in you, even if you both have never talked to each other?
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