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The phenomena where people act crazy and make faces when looking at a mirror. They will not make those faces otherwise and only they do it when they see themselves in reflective surfaces.

Some would feel a weird urge to do those faces when looking at a mirror. This is referenced in many movies and shows where the actor make funny faces looking at the bathroom mirror.
Man 1: look at that dude making stupid faces in front of the mirror
Man 2: aaah. he is having the mirror effect
Man 1: You know, every time i look at myself in a mirror, i can't help but re-enact stupid scenes with exaggerated facial expressions
Man 2: Many do that, that's the mirror effect.
by Slvador Limonis February 08, 2013
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