This is the $95 Piggyback Rider,a set of two harnesses (one worn by the adult with a foot-bar and grab-straps at the shoulders, and the other by the child with two carabiners that attach to the adult's) that allow a kid to stand on your back indefinitely without falling or you having to hold them. Obviously, and it's perfect for a parent wearing stilts and a long black cloak so you can pretend you're a two-headed ogre.
Keep going for a couple more shots and an as-seen-on-TV style commercial while I fondly recall how my dad used to drift me just above his head with a bunch of helium balloons tied around his armpit.
Source: geekologie.com