Light On, Light Off

JAC has learned how to use the light switch.  It is now his favorite hobby and he spends a good portion of his day turning our lights on and off.  He perches on the edge of our couch to reach our living room light switch.  When I put him to bed he jumps on his bed for hours so he can reach the switch and turn his bedroom lights on and off.  Now half of my daily shower is spent in the dark while JAC stands on the toilets and hits the lights shouting, "On!Off!" at the top of his lungs.