Well, that's all the life with kids that is shown here: Their capacity to pay attention is short, and they are always looking for something to have fun with!
The concept is excellent -- children at play and each with a different view of the moment, while their mother or sister looks away. The only problem is the merger at right -- the kid doing the throwing seems to be hitting the kid in the background in the face. An unfortunate merger, easily solved by a little step to the side.