Dakota Johnson had a blast on Wednesday’s The Tonight Show Starring Jimmy Fallon, as the Fifty Shades of Grey star introduced host Jimmy Fallon to a fake game she invented with her family.

“I only played it once,” Johnson admitted, before explaining the rules.

Johnson’s first scenario was this: Darth Vader, her fiancĂ©, has called in to say he’s leaving her for another woman.

“Hi babe,” Johnson said upon answering the fake call.

“Did you just wake up?” After the fake Darth Vader explained w he was and who he was with, Johnson became angry.

“Who the f-?” she said, stopping short because Johnson realized she just cursed on national television.

Later in the show, Johnson said she hadn’t laughed till tears since filming her new movie, How to Be Single.

Dakota Johnson