Does anyone else with multiple chins ever see them having "wheel duels"? We got a flying saucer a few weeks ago, and both girls are using it regularly, but tonight I noticed them being a little strange. One will jump on the wheel, run as fast as she can, then jump off. The other will then jump on the wheel (while it is still spinning), run as fast as she can, then jump off, and repeat and repeat. I'm hoping this is just playful behavior, a sort of "anything you can do, I can do better" thing, but is there anything I need to worry about with regards to safety? I don't want anyone flying off of the saucer...