I fell afoul of this change myself a couple of weeks back, and despite the disbelief of several commentards above, I also had a selection of questions for which I had no answer. Don't drive, didn't hate a teacher (more than any other), wouldn't describe any particular friend as being "better" than the others, don't remember where I was on 1st Jan 2000, etc. But then if you remember it, you weren't really there, or so I hear.
So if I ever come to forget my iTunes password, or whatever circumstance where you're expected to answer these questions, I'll have to guess at what my fictional answer/s were, undoubtedly get them wrong, and get banned for being no better than a News of the World account "hacker". There are several better ways to prevent children from running up big bills on iTunes. "Don't give them your sodding credit card number, you lunatic" being quite high on the list.