The 31st Rock and Roll Hall of Fame induction ceremony welcomed N.W.A, Deep Purple, Chicago, Steve Miller and Cheap Trick into its pantheon Friday night at Brooklyn's Barclays Center. Surprise performances by David Byrne (with the Roots) and Sheryl Crow (with Grace Potter) added to the mix, making for a lively and unpredictable evening. Here are the big night's most unforgettable moments.