Staring contest with guys, literally. -.- Help?

I was really angry at this boy in math class for stealing my pencil after he asked for it a week ago, so just recently I got his eye when he was walking back to his seat and I literally gave him the death stare. It was so bad, that he had to look away.
How can I get my pencil back?

And more importantly how much does it matter to give a guy the really iamsomadatyourightnow stare?
I'm pretty sure he thinks I'm a creep now because he used to talk to me a little and now he doesn't
Yes, giving the death stare will have a great effect on him
Probably thought you were just staring at him
Thinks your weird
Other
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Staring contest with guys, literally. -.- Help?
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