A previously unknown stranger-in-the-mirror illusion has been described. According to this 2-page academic paper, under the right lighting conditions, the participant just has to gaze at his or her reflected face within the mirror and usually “after less than a minute, the observer began to perceive the strange-face illusion”.
Unfortunately, the intriguing citation for "Margaret Thatcher: a new illusion," Perception 9, 483 – 484 1980, is restricted.
Caveat lector: I haven't tried it personally but as far as I know, this is not a hoax.
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