I was just volunteering some time reviewing First Posts, and SuperUser presented an answer regarding not Broadcasting SSID's. The answer was technically correct, but very misleading. I took my time to write a thoughtful and well-researched comment in order to provide better context.
When I submitted the comment, the SuperUser system said I failed the test because the answer was correct and the only appropriate action was to upvote it or do nothing.
In fact, the thing that failed was the SuperUser system!
After it said that I "failed", it showed the comments to the answer (which were hidden during the test), which finally revealed the misleading nature of the answer, and asked why that answer had so many upvotes.
My comment, and the time I spent composing it, was lost.
It appears the test was created by someone or something without sufficient knowledge or experience to be writing tests. :-)