This is Ty's FAVORITE thing to do right now. He pushes his school bus all over the house. He has figured out that when he runs into a wall to crawl to the front and push it out and then stand up again and go in another direction. When I wake him up in the morning he immediately crawls over to his school bus and starts walking around the house. He also knows the button that plays the music. Neil and I have heard, "stop and go" about ten million times.