When it's spinning parallel to the ground, support your weight on your left foot and use your right foot to power your spin; the momentum of the hoop should carry you around.

One image shows two sides of the balloon as the centre shatters, left, while anotehr shows a balloon as it appears to spin mid-burst

Announcing the deal, Mr Ballmer (pictured, left, with Skype's boss, Tony Bates) tried to spin these as opportunities.