Light on, Light off

Kosse received a great stepstool from Auntie Aundrea, Uncle Chuck, Alison, Amelia, and Charlie for his 2nd birthday.  He carries it around with him in the house and I think he is trying to show he has big boy muscles because it seems a little on the heavy side for a 2 yr old.  Currently, his favorite place for it is underneath the lightswitch in  the bedroom.  He likes to stand there and turn the light on and the light off and the light on and the light off...