Confessing the truth about an information, whether asserted true and actually false, or asserted false and actually true; to mock the person believing it, who is now solely responsible for continuing to believe it. It often takes the form of hiding in plain sight, ridicule, irony, sarcasm.
Apollo 11's Hollywood starwalk such a blatant revelation of the method
12 step recovery jargon referring to someone new who talks about how great life is, now that they'resober. Usually meaning that the person is out of touch with reality.
The new guy seems pretty happy for a dude who has no job, no money and no family. He must be on a pink cloud.