Gzuzkryzt, can you tell me why cats are so popular as avatars now? I really liked your optical illusion avatar better though I am something of a cat person myself (only one though...).
I heard someone say that they've heard of a challenge like this before, and the challenge/prize provider responded to a test once with something to the effect of: "Well I'm not convinced; you lose." And there really was nothing the test taker could do about it.
And as I read through the thread again (thanks for reminding me about Satan's question), I am still not convinced this couldn't happen. For example, Randi could overview the video of a successful applicant in a double-blind test and say: "Well you (the test givers) obviously didn't see how this person is cheating by doing ______ like I've seen other magicians do before. Its my test. I overule you, and say the test taker was cheating. End of story."
But what if the test taker wasn't cheating? Or knowingly cheating? What are the checks against this happening? Other than a possible lawsuit, I don't see any check against Randi doing something like the above--if he were so inclined-- and I am not saying he is.
Is that what you were looking for?