Barkley and Jordan both do this, but apparently for a different reason than most...pure laziness! If they're laying down and see a toy near them rather than get up and get it, they'll roll onto their backs and try to get it from an upside down position, which can be very, very entertaining. Imagine the toy being near the dog's bum, they're on their back and trying to reach it with their mouth. Not the brightest bulbs, these ones, but oh-so-funny!!