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WATCH: Jimmy Fallon's EPIC 'Game of Thrones' April Fools' Prank!

The final season of Game of Thrones kicks off in a couple weeks and HBO has a zero spoiler policy for the cast right now which is why Jimmy Fallon's April Fools prank was so epic last night! Maisie Williams is one of the shows stars and she was the main guest on The Tonight Show when she "accidentally" dropped a spoiler mid interview! Maisie is quite the actor because she had everyone fooled for a good minute with her reaction. Check out the amazing prank below!