Before you read on; I am against all animal torture and abuse including insects. That being said: A simple plus/minus 1V signal from a beat-heavy song can be used to stimulate the motor neurons in the leg of a cockroach. Using setups like this can help us understand how neurons and muscles work, and can assist us in understanding our own nervous systems. Ooooooor make cockroach leg wiggle wiggle wiggle ahhhhhh