You see similar things all the time in public loos
The screw has a head like a straightened-out cam so that you can tighten one with a flat head screwdriver but need a special tool to loosen it. This is pretty much why I figured it was a hoax: there are less moronic ways of making one-way screws.
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jonbob loves you, Tue 14 Aug 2012, 19:15,
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