May 01, 2015 at 06:00 PM EDT

Jimmy Fallon has had a host of Avengers stop by The Tonight Show lately, including Chris Evans and Jeremy Renner—but he may have met his match in Scarlett Johansson.

On Wednesday, Johansson and Fallon faced off in the late-night host’s staple Box of Lies, in which each person selects a random box, then has to convince the other contestant that they’re lying or telling the truth about what’s inside. While Johansson may be abke to keep a straight face as Black Widow while trying to save the world, she breaks much more easily when the stakes are a bit lower.

There’s no shortage of bizarre items stashed away in this round’s boxes—and though Fallon takes an early lead, the game’s arbitrary intense bonus round offers Johansson a chance to come out on top.

But regardless of whether she wins, the star can take a few souvenirs from the game home… including a Black Widow toy sitting next to Gumby on a bench.

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