The hand-made gadgets of prison inmates
Marc Steinmetz's "Escape Tools" photographs showcase the ingenious hacks of prison inmates made from detritus and scrounged materials. Not all of the items are for escape in the strictest sense. This tube of horseradish paste, for instance, was fashioned into a not-so-crude hash pipe. Harsh.
Escape Tools [MarcSteinmetz.com via MAKE:]

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Looking at the radio transmitters made me think Germany has a lot smarter prison populace than we do here in the USA, then I saw that one of them was hidden inside a technical manual on radio transmitters.
that's a nice little gallery, are there any more of these on the internets?
The dagger is not a crucifix, its just a cross
I'm amazed by the ingenuity of some prisoners. Prison-made firearms are always impressive, but other things like the knuckleduster and the cross dagger are brutally effective. The wrist rocket is me favorite.