Sporcle quizzes have popped up a few times here, but not since they've added the ability for anyone to create quizzes. So there's a lot of possibilities here if you got a little time on your hands.
I just put this one together - how many of FOF's top 100 posters (as of about 9:45 AM Mountain Time today) can you name in 15 minutes (without looking, of course)? I think it works.
Can you name the FOFC Top Posters? - sporcle