This is a little something I did when I had a spare hour and some old central vaccum PVC. I took the regular Kodak Tazer and stuck it inside an insulated altoid tin. I covered the inside of the tin in Duct Tape so the charge wouldn't reach the can. I also took off the metal button normally used and attached a bump switch from a computer mouse, so I wouldn't shock myself every time I used it. I took the two "shocking" wires down a piece of PVC, near the front, stuck them through a piece of cardboard, and added some extra solder on the ends. Hot glue the tin to the back, and congrats, you have yourself a cattle prod.
Sorry, I would have made an instructable, but I didn't think about it at the time.
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