Lauren and Julia Yee, 15-year-old twins and contortionists in the Make 'A' Circus touring summer show, settle in front of the television in their Oakland home to watch a video of a recent performance.

America's Got Talent's judges and viewers at home alike were left gobsmacked when a creepy contortionist group took to the stage. The professional group of contortionists, known as the Atai Show, hit ...