Will invented this game to get around the fact that he's not allowed to throw balls in the house (neither is daddy). He is allowed to throw Roar - his lion blanket-doll which used to be solely a bedtime comforter but has become a regular plaything (and now we frequently are frantically searching for Roar around the house at bedtime).
So we often play "Roarball" - using Roar as the ball (you also have to roar like a lion at various points in the game). We use mom's dusting wand as a bat. It's funny, Will knows enough about baseball to make sure all the terms are represented - strikes and outs and hits - but I don't think he understands that it's a competitive game. He counts his misses (sike one!) as if they are accomplishments as much as is hitting Roar. Sometimes he and I will argue about a suspected hit, with me telling him I saw him hit Roar and Will insisting it was a strike. This can get frustrating at times because he rarely makes contact, and the theatrics between each "pitch" can make this game go on for a long time - often when mom is waiting for us at the dinner table and we're just trying to get "one more hit". Fortunately, every hit is a homerun so the games always end with heroics.