This bizarre incident happened on October 12, 1960. Japanese politician Inejiro Asanuma, a leader of the Japan Socialist Party was participating in a televised debate for the coming elections for the House of Representatives. The man was a highly controversial figure for an incident in 1959 when he went to China and called the United States "the shared enemy of China and Japan." He came back to Japan wearing a Mao suit, which got him criticism even from the Socialist leader.
During the debate, a 17-year-old right-wing extremist jumped on stage and stabbed Asanuma with his samurai sword. The entire incident was broadcast live on television. The video was kept and can be found online if you know where to look. The photographer who caught the photo on the right won the pulizer price for it.