Michael Jackson co-designed and patented a special shoe meant to provide anti-gravity illusions by nailing down dancers when necessary. Three neurosurgeons from the Postgraduate Institute of Medical Education and Research in Chandigarh, India — Nishant S. Yagnick, Manjul Tripathi and Sandeep Mohindra — have revisited how the King of Pop achieved the 45-degree lean while keeping his spine straight, not just on Smooth Criminal (Official Video), but in live performances around the world. The paper published (PDF) in the Journal of Neurosurgery.