I'm sure that what I do is actually a very common practice.
I read most of the quizzes and try to remember what fic they came from, but I don't make any official guesses.
Why? I'm terrible at it, but it's fun to check them out anyway. It's also a way to maybe get interested in a fic that one may have missed along the way.
Tank (who, being old, finds his memory is even worse than it was before)