The article also reminds me of another anecdote.Many years ago in the last millennium I checked out this German teenage forum (bravo.de) because well, I was a German teenager. Anyway, on that forum you could not only give the answer to the security question. They even allowed you to specify the question you want.
That feature amused me a lot and I checked out other people's self-made security questions. Being a teenager forum in the later 90s this is what happened. A very substantial number of forum users had the security question 'what is my favorite Backstreet boy' or a variation thereof. And, well, pretty much everybody loved Nick Carter. Nobody liked the others. In just one our I was able to log on to many, many accounts just with the phrase 'Nick'.