Soccer in the House?!?

It's a firm rule that there is no playing ball in any room besides the toy room and basement.  I however made an exception today when the boys found a $.99 air, padded soccer ball that when turned on glides on the floor.  I used to have one as a kid and remember playing with it so I couldn't deny them the fun.  It was beyond worth it; they played with it until naps, were constantly laughing while chasing after it, and burned lots of energy.