He looks like he also just realized what his name was.
Never has someone's name left them with less choice about becoming a class clown. Sure, Rowdy Negro could have just kept totally silent, become an accountant and hoped no one (except maybe an equally quiet Mrs. Negro) would ever say his name out loud. But instead, he loosened up that class tie, made a funny face and said "screw it, I'm stuck with this offensive name forever, I may as well be pleasant enough to make up for it." Or, so we think from this picture. He could still be a quiet accountant. We don't really know him.