The man who used jibberish sign language at Nelson Mandela’s memorial service also used incoherent hand gestures to sign a notorious anti-white song sung last year by current South African President Jacob Zuma. Thamsanqua Jantjie, 34, late said that he is schizophrenic and was hallucinating during the Mandela memorial speeches. The interpreter also admitted that he’d been prone to fits of violence in the past, an admission that was worrisome given his proximity to President Barack Obama and other world leaders. According to NBC News, Jantjie has worked two other gigs on behalf of the African National Congress (ANC), South...