Via Userfriendly, I arrive at Correlations. The idea is simple. You have two questions, and the aim is to check for correlations between them. You can submit your own questions. Obviously, the quality of the site will depend upon user submitted questions, and there are some duffers in there already.
The site isn't tremendously user friendly, the opened out form with the stats is larger than any screen I've seen it on to date - and one has to hit 'next' to get the first question. If submitting a question, there is no preview screen, or ability to delete it if it's gone wrong.
That said, it's quite good fun. For about a minute or so.
I've entered question number 348 (type in 348 and hit 'next') - I also did 347, but typoed! Have fun!