Officers were trying to keep the traffic-snarling crowds on the opposite side of the street in wake of 50 Cent’s arrest Friday, but one did pause long enough to tell Radar about the G-Unit mainman’s behavior. “He was being an a**hole, speeding or some sh**,” the cop said. “They stopped him and he wouldn’t give up his license. He kept saying, ‘You know who I am. I know you know who I am,’ so they had to lock him up.” The officer then turned to a colleague and said, “You believe this mook?” The full story, including some photos of 50 and his $466,000 Lamborghini Murcielago, have since been removed at radaronline.com.