I observed this with http://mozilla.github.com/ for at least quarter of an hour. At least one other thing was broken, too: the pagination controls at the top and bottom of issue pages were rendering as escaped HTML. That was still broken for a few minutes after pages returned.
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[ 5.0 ms ] story [ 18.6 ms ] threadI have no idea what happened. For about 15 minutes I was getting github 404s for all github pages.