In 1911, inventor Frank P. Snow invented this “hat guard” to inflict a painful punishment on any creep with the gall to steal a chapeau belonging to another gentleman. From Weird Universe:

A thief could take the hat, but if he tried to put it on, a “guarding prong” would jab into his skull. The prong locked in place and could only be moved if you knew the code to the combination lock.

from Boing Boing https://boingboing.net/2018/06/14/a-painful-device-to-punish-hat.html

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