Shocking Tanks is a novelty game involving remote control toy tanks. Each player controls a tank, moving it and firing the "gun" (in actuality an LED) at the other tank. The novelty is that when a tank is hit, the player is given an electric shock by the controller.
Shocking tanks became popular in the U.S. and UK during the 2004 holiday shopping season when they were introduced by such novelty retailers as The Gadget Shop and Things You Never Knew Existed catalog.
References
Shocking Tanks Wikipedia(Text) CC BY-SA