Instead of an exploding wallet I suggest a burning hot credit card (fake) that will fit in any wallet. People who want one can keep their favorite wallet and just insert the BHCC whenever they’re in the shady side of town. Upon getting mugged the muggee flips a switch to activate the BHCC and the thief yelps, drops the wallet and flees. Flip it off to retrieve your wallet. $9.95 for a pack of two. Profit!
Just hook your wallet chain to the pin of a hand grenade, stencil “Fossil” on the side, and slip it into your back pocket.
Yup, because he has to figure out how to pay all those medical bills to reattach his hand, or whatever.
My parents know a guy who (many years ago) booby trapped an unoccupied house with a shotgun, because the house kept being broken into. The booby trap worked, the guy who broke in wound up in a wheelchair for life, and the homeowner was sued and lost everything he had.
You could see the house from the highway; I remember my folks pointing to it and shaking their heads. They were lawyers, so they were shaking their heads that the guy had been ignorant enough to booby trap his house. Not a close friend, just someone they knew.