Need training against a knife but don't want to look like Zsasz from Batman? Use the Shocknife, which looks like a knife, hurts like a knife, but doesn't cut your skin. With up to 7,500 volts but less than 1 milliamp, the Shocknife provides law enforcement and self defense classes real world experience with bladed weapons. The shock is activated but a button on the grip, and has four settings, "LOW", "MED", "HI", and "X".
If they could make a low-powered version of this thing I bet kids would snatch it up. Cuts like butter.