Frequently.
Here's one example.
http://www.randi.org/jr/070502.html
A person lists what's wrong with Randi's challenge.
<< Randi alone will say whether the terms of the challenge have been met — whether the metal was bent psychically ... In the event that the claimant insists the written terms have been met, but Randi disagrees, then it will be Randi's decision that prevails. >>
Randi responds << When he mentions "whether the metal was bent psychically, ... he misses the whole situation. We don't give a damn how something happened, only whether it did happen, under careful observation >>
Like it or not, that's how his challenge works.
Someone claims the ability to bend metal. Randi challenges him to prove it.
If he can do so under the agreed protocol he wins. Normal, or paranormal, bend metal under the agreed conditions, he wins. Randi doesn't give a damn how it works, just as long as it works.
And then there's the Tice Clock, a device that supposedly improves the quality of sound on your Hi-Fi. Randi challenges the makers to prove it works. To win, all they have have to do is prove it works. Normal or paranormal, prove it works and win. Randi doesn't give a damn how it works, just as long as it works.
And then there's the magnetic wine clip, a device that supposedly improves the taste of your wine. Prove it works, through means normal or paranormal, and win a million. Randi doesn't give a damn how it works, just as long as it works.
Randi has issued a challenge. He has demanded that I display an ability to find dry spots. I can do that, and it's not paranormal, but Randi doesn't give a damn about that. Under his own rules.