could do like my dad did. he went and bought a motion sensor and attached the alarm wires to a motor and connected a paint ball gun to the motor... I might have a copy of the paint ball gun design here. but as the motor spins "runs off a 12v battery" he mig welded a piece of pipe to act as a finger so every revolution the motor made it fired a round.. i think he got something like 25 shots out in like 10 or 15 seconds.... It wont kill the guy but it sure will scare the hell out of them. I'll call my dad tonight and see just how he did it.. i know it wasnt expensive i think 10 bucks for the sensor, maybe another 10 or 15 for the motor. already had paintball guns.. Ohh and if you try this make sure to get either glow in the dark paint or UV paint....For when the police go looking for them..