You have probably never heard of Jen O'Shea, but a few years back she was diagnosed with bone cancer and underwent an operation that not only saved her life, but gave her the ability to pull off one heck of a great leg trick that will make you cringe and scream. The surgery left O'Shea with the ability to twist her leg 180 degrees...whaaaaaatttt? Yes. O'Shea even entered a contest for the 'Ellen' show. She didn't win the contest, but her video of the reactions of her friends and family to her talent went viral See it below...if you dare...yikes!!