It must be a Daddy thing. A Mommy would never do this. At least this Mommy would never do it. But it sure looks fun!
Hubby's dad invented this funny little manoeuvre, which he calls an "Ur," in which he flips a baby from his legs, over his head to land in a little giggling ball on the couch. When I saw him do it with our first child, I nearly had a heart attack. Now I laugh and try to capture the action on camera. Such is the education of a mother.