January 21, 2016 10:40 AM

Now we know what game night looks like at Dakota Johnson‘s house.

The Fifty Shades of Grey star stopped by The Tonight Show on Wednesday night, where she introduced host Jimmy Fallon to a fake game she invented with her family and friends. They simply called it “The Acting Game.”

“I’ve only played it once,” Johnson, 26, admitted. “You get a fake scenario and answer the phone and act out the scenario.”

Fallon, 41, gave Johnson her first scenario: “Your fiancé, Darth Vader, is calling to tell you he’s leaving you for another woman.”

Without missing a beat, Johnson jumped straight into character and answered the phone.

“Hi babe,” she said to the fake caller. “Did you just wake up?”

After Darth Vader started explaining where he was and who he was with, Johnson started to become angry – a little too angry for national television.

“Who the f—?” she said, stopping short when she realized she dropped the F-bomb.

“Hang up the phone, hang up the phone,” said Fallon as he started cracking up laughing. “It’s an adult game.”

Watch the hilarious accident and the duo act out even more scenes – without cursing! – in the video above.

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