The invisible Mirror Prank
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In this prank, a public bathroom has been modified so that both halfs look exactly the same, and a glass has been fitted between the two sections. A pair of twins has been trained to act and respond exactly in the same way to people who fall in the prank. When somebody enters the bathroom, and looks through the glass, only sees the twin on the other side, and cannot see him or herself reflected in the fake mirror of course. The prank is so mind buggling that even thought the twins are females, a guy that entered the bathroom had more interest on the fact of the fake mirror and his reflection not being there that forgot somebody should had been in the wrong restroom.