Who knew Jennifer Garner was so competitive! The Dallas Buyers Club star was insanely focused as she played a hilarious game of Catchphrase on the Tonight Show on Wednesday, Oct. 1, alongside teammate Jimmy Fallon and fellow competitors Questlove and John Mulaney.

Eager Garner, 42, rubbed her hands in anticipation of the competition and had a steely look of determination on her face as the game began.

The Alias alum became increasingly frantic as the game progressed and the buzzer's tick started to get faster while she acted out a high-octane Cookie Monster and correctly guessed Fallon's impressive Matthew McConaughey impersonation.

Despite Mulaney and Questlove's valiant efforts to win a round, Garner's insane focus (and progressively higher pitched voice!) helped her and Fallon steal the game, guessing each other's catchphrase each time, before speedily passing the buzzer off to the opposing team.

Watch the whole game now and see Fallon and Garner's victory dance!