not gonna lie this is driving me nuts childhood mystrey solved: why did teh duck sometimes fly like it was taunting me? Because my cousin had a second controller.
Duck Hunt on the NES lets player 2 steer the duck in Game A. You don't need any code, just plug in a controller and start Game A while teh other person uses the Zapper.
Its hilarious, simple and kind of mean. Best rediscovery of the year.