Have you ever noticed the noises that little boys make when playing with toy cars? ALL of them make the sound of engines roaring and tires screeching. It must be programmed somewhere in that Y chromosome.
And, it appears that it's not just human little boys who carry the trait. Our little monster was doing the crazy psycho-cat run through the house last night. As he came bounding into the family room his paws touched down on the floor (once), then he became airborne and flew onto the desk and, I tell you the truth, he was making a vroom-vroom noise while creating a wake of destruction.
I'm not sure I'm cut out for this.