Dakota Johnson, the star of 50 Shades of Grey, was on The Tonight Show with Jimmy Fallon last night and shocked, shocked everyone by accidentally letting slip an f-bomb.

https://www.youtube.com/watch?time_continue=2&v=YUAd-kefT0w

It was part of a game she was teaching Fallon called "The Acting Game," in which the player improvises a given conversation on the phone. The fake scene Fallon gave her: "Your fiancé, Darth Vader, is calling to tell you he's leaving you for another woman." Johnson was not ​having that, and was quick to curse Vader out, quite literally. Still, it's weird how taken aback Fallon seemed by the f-bomb, considering that:

A. The Tonight Show is taped at 5 p.m.—the show doesn't air live, it's not SNL.

B. Dakota Johnson is the star of a movie series in which the only thing that happens is that people "f*ck."

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But hey, at least something unscripted happened on Fallon for once.