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Jim Carrey chatted with “Extra” at the L.A. premiere of “Sonic 3,” which sees him playing two roles this time around as Ivo Robotnik and his grandfather Gerald. He quipped that the characters get to experience the “bond of familial darkness that all of us are so familiar with.” Jim also spoke about his commitment to his characters — he even shaved his head in the movie! Plus, he had an epic reaction to all the questions about a possible “Grinch” sequel. “Sonic 3” is out December 20.