I saw this answer which was written by Answer Bot which (as far as I know) shouldn't (yet) post anything to a public site and especially not to any public site that doesn't even have Answer Bot.
The parent question of that answer was migrated from UX Stack Exchange which has Answer Bot so it seems the migration "showed" that answer for some reason as noted by cocomac.
[EDIT]
The migration has been rejected resulting in the post being back on UX SE with the answer being hidden. The migrated version of the post with the answer is available using the Wayback machine thanks to Jeremy.