Just curious, what would happen if you voted up your own question or answer? I don't want to test this out in case I lose reputation or something.
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Hey, always nice to see new faces on the site. You should join us in chat! – GnomeSlice Sep 7 '13 at 16:43
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The system prevents you from casting an upvote on your own questions or answers by way of a message telling you that you can't. There is no rep penalty invoked or anything, since it's very plausible for users to click that button, either accidentally or out of curiosity.
