Shark attack video authenticity questioned

This video of a guy allegedly fighting off a shark attack in Australia's Sydney Harbour has gone viral.

The authenticity of the video is being called into question.

What do you think? Is it real or fake?

Also today on Trending Now, Ellen reads text message auto corrects, Jim Carrey and Jeff Daniels stop by the Tongiht Show to talk about "Dumb and Dumber To" with Jimmy Fallon, John Oliver talks to Seth Myers on Late Night about the World Cup, actor Gerard Butler makes a guest appearance on Jimmy Kimmel Live and Christopher Walken talks about his meeting with Marlon Brando on the Late Show with David Letterman.

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