The clues: In the Robot's video montage there are clues about the periodic table, a fire truck, and a skateboard. The Robot also mentions how they relate to robots because they've always felt the "need to put on a tough outer shell."
Who it might be: Though the judges guessed Jackass actors Johnny Knoxville and Steve-O based on the tough exterior comment and skateboard clue, fans believed it might be Lil Wayne based on his low voice during the performance.