I gave 5 answers on superuser. One has been downvoted, and apparently no other answer has been upvoted, so I currently have only one downvote. Despite this, I've been awarded the "teacher" badge, which is supposed to be granted only when you get upvoted.
migrated from meta.stackoverflow.com Jul 22 '10 at 17:57
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The best I can think is: maybe somebody upvoted one of your replies and then revoked it? (after all, a downvote+revoke awards critic...)
(the numbers don't support the alternative theory of 1 upvote and 2 downvotes)