What is Mechanical Placebo?
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An impressive looking device or scheme, that in fact, does nothing. It is commonly believed that pedestrian controlled traffic signals and signs warning that police monitor speeders by aircraft, are blatant examples.
Why are you pushing the "close" door on this elevator? It's just a mechanical placebo.
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This is a prank 2 people play on one guy. One guy stands in back of the victim and one stands in front. The guy in back starts by poke..
