CatA-Replies-Replies. These have root -> CatA.
Update: The below have been fixed, but the above are still a problem!
These appear to be threads that were SoPWified, but the root field of the deeper replies still points to the original Q&A Category.
These were found by bad root_nodes.
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Hope and Pray
Hash & Salt using Acme::XKCD::DebianRandom
Hash & Salt using other rng algorithms
Printouts secured with physical locks
One of a million Post-Its sticking on the monitor
A piece of paper taped to the backside of the keyboard
Results (74 votes). Check out past polls.