Lying comfortably on the sofa in his dimly lit house, the comedian Bill Cosby seemed pretty relaxed at 7:45 a.m. on Oct. 25, his eyes half closed and his smile charming, as usual, even though five 3-inch-long needles were inserted into his head, eight 4-inch-long ones were in his round belly, and 10 3.5-inch-long ones protruded from his legs and feet.