The man providing sign language interpretation at Nelson Mandela's Memorial Service makes no sense, according to signing experts.

Sources say the interpreter was "gesticulating gibberish." How the man got security clearance is a big question considering that he stood next to President Obama and other leaders from around the world.

The South African government is looking for the man, who seemingly has no connections to the deaf community. It's an odd mystery and not a new one: records show the same man "signing" next to President Jacob Zuma a year ago.

UPDATE: The fake signer has been found. A self-described schizophrenic, Thamsanqa Jantjie has been charged with a series of wrongdoings during the past 20 years, including kidnapping, rape, and murder.