Via Brad
DeLong, I found this neat ESP experiment.
Brad says his Nine-Year-Old child figured out how it worked the second time
through, and he took considerably longer. I figured it out the third time
through, so I’m smarter than a full professor of economics at Berkeley, and less
smart than a nine year old.

If you flick around on the site you’ll find some
very funny attempts at explanations for how the prediction is made.

UPDATE: Kevin Drum makes the same joke I do about how long it took to figure out how it worked. Guess my sense of humour isn’t quite as unique as I thought it was.