President Barack Obama speaks at Nelson Mandela's memorial service in Johannesburg. Standing to his right, Thamsanqa Jantjie gestures as if he is interpreting the speech for the deaf community. Alexander Joe/AFP/Getty Images hide caption

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As President Obama and other world leaders spoke Tuesday in Johannesburg at a memorial for Nelson Mandela, a man stood nearby and appeared to be doing sign language interpretation. Many in the deaf community are outraged because the man appeared to be faking. Pedro Ugarte /AFP/Getty Images hide caption

itoggle caption Pedro Ugarte /AFP/Getty Images