James Randi Quote

… it's time for the opening lecture in Test Design 101: Consider: a woman claims to be a musician. You seat her at a piano and demand that she prove her claim. She cannot play the piano, and you conclude that her claim has been invalidated. Hardly. You see, the lady is a cellist….
You cannot challenge a claimant to do something they've never claimed they can do. That's why, at the JREF, we design a protocol only after the applicant has clearly stated (a) what they can do, (b) under what conditions, and (c) with what expected degree of success. And, the applicant must find the protocol appropriate, fair, agreeable, and adequate to prove their claim.

Swift, 21 October 2005, "Good Intentions"; about testing paranormal claims.