Welcome to the theater of the absurd.
They brought out a man to translate the ceremony for Nelson Mandela's memorial service and he turned out to be an attention starved incompetent. If you are trying to coordinate such an important event, one of the recurring nightmares is to end up with a clown who can't actually do proper sign language. The temptation of being able to stand there and have people treat him with respect must have been too much.
This will be done to death by Saturday Night Live.