Marie Claire cover girl Blake Lively showed up on The Tonight Show to promote The Shallows (AKA that completely terrifying-looking shark movie), and played a game of "Know It All" with Jimmy Fallon.
Only this was no mere "game" to Blake. Girl came to win. She also came armed with a bunch of not-at-all-nerdy Harry Potter knowledge (#hero), and called Jimmy Fallon out for saying "shit" on television.
Basically, she wiped the floor with him in the most literal way possible:
Watch below to see Blake slay as Jimmy struggles to get in formation.
Follow Marie Claire on Facebook for the latest celeb news, beauty tips, fascinating reads, livestream video, and more.
![](https://hips.hearstapps.com/hmg-prod.s3.amazonaws.com/images/katy-perry-orlando-bloom-gettyimages-1169491884.jpg?crop=1.00xw:0.754xh;0,0.0844xh&resize=480:* "LA Premiere Of Amazon's "Carnival Row" - Arrivals")
