When my toddler starts doing things that I don't want, like throwing a ball at me, I show him how to throw the ball towards the wall or something like that. I found that telling him to stop doing that will not stop him. Instead, I try to divert his activity in a different direction, this has helped me a lot! Also, when he picks up a crayon and starts scribbling on the walls, I get him a paper or book so he can draw in it, this helps too..most of the time! LOL