No seriously, who is Paul McCartney!?
One of the latest trending topics on Twitter revolves around people asking who this Paul McCartney person is. To some people, McCartney was a new artist that they just discovered thanks to the Grammys. To others -- possibly most of the world -- the fact that people couldn't identify the Fab Four member was an outrage.
Here are some of the most memorable tweets asking who this strange man performing at this year's Grammys was.