Who needs a Chair?

Lately I keep catching Cole sitting on top of balls. He loves sitting on them and bouncing up and down. It makes me so nervous that he is going to flip off or hit his head on something. It drives me nuts! I have no idea where he got the idea to sit on top of them either because Marshall and I have never done that in front of him (well, we won't count Marshall out just yet). But he is constantly doing it! And it really amazes me on how well he can keep his balance! He could sit there all day!