The sign language interpreter at Mandela’s service was an imposter.
A solemn imposter. Also—fortunately—a safe one, although no one seems to know who he is or how he got there. He was so close to Obama and other world leaders that he could have touched them, but he did them no harm except to pretend to translate their words into sign language, although deaf people immediately recognized that his signs were meaningless gibberish.
That is so absurd, so unbelievably negligent, that it outdoes any Saturday Night Live skit or Onion article. And speaking of Saturday Night Live, this is what almost immediately came to mind:
[ADDENDUM: From a commenter at Ace's---"Dan Rather said 'He was fake but accurate.'"]