No problemo...
It's a basically about the power of suggestion. He's saying that we can hear what we want to hear if we get the right stimulus. Much like an audio peradolia if you will. He uses the old stairway to heaven backwards play. You don't hear much at the start but after he give you the "sweet satan" lyrics that all you ever hear.

(I've seen Shermer do it before too).
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"Extraordinary claims require extraordinary proof." - Marcello Truzzi