Cory has been playing with this since he was very small:
I've been seeing this thing repeatedly at Petsmart when getting gushifuds or volunteering at adopt-a-thons:
I couldn't resist. It cost less than the two of us splurging on burgers and fries for supper. Clearly, it's a big hit. This was taken about five minutes after we set it on the floor -- he went after it in a matter of seconds, but it took him a moment to adjust to the differences.