dusty places

As Maddie was bouncing her new bouncy ball from the dentist, she said to me with disappointment and a bit of distress, "Mommy, every time I bounce my bouncy ball it gets dust on it."  I said, "Well, Maddie that's normal.  It's bouncing on the floor so it's going to touch dirt and get dirty."  She replied, "But no, Mommy.  It just keeps bouncing and going into all the dusty places, and that's why it's getting dirty."  Ooops...I guess I need to vacuum the floors.