WonderHowTo has a gallery of jailer key guns, which came in handy in the days of yore.
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Most correctional officers today do not carry firearms, unless they're isolated away from the prison population. But back in the olden days, prison guards on their rounds needed a little backup power in their hands, especially when opening cell doors—usually a two-handed job.
So came the birth of jailer key guns, a cell door key that doubles as a primitive one-shooter. Filled with gunpowder, "turnkeys" could fire the miniature key-pistol in case there was any trouble with the prisoner when opening the door.