Place it at the exact moment a hidden setup is exposed, then follow it with a fail sting to underline the failed cover-up. For a slower build, open with It Was At This Moment He Knew before the reveal, then let this clip answer it.
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This is a very short spoken line, lasting under a second, in which the Wizard tells Dorothy and her friends to ignore the man pulling the levers behind the curtain. It feels sheepish and panicky, like a bluff collapsing the moment it is spotted. The line comes from The Wizard of Oz, where the all-powerful Wizard is revealed to be an ordinary man operating a machine.