My nine-year old son is becoming a baseball addict. The World Series - which he followed closely - ended weeks ago, but he has been endlessly sorting his baseball cards, asking me every few minutes who is better. He walks around mimicking throwing a ball, I suppose, perhaps, turning a double play, or perhaps throwing a slider to an imaginary hitter (he inadvertently smacked his brother in the face the other day with a sidearm pitching motion)
Which reminds me, I did the exact same thing as a kid. I walked around constantly turning two, or throwing imaginary submarine pitches, or even hitting invisible home runs over my kitchen table.