It was on Thursday between Jennifer Lawrence and Jimmy Fallon.
The X-Men star appeared on The Tonight Show and played a game of Box of Lies against the host, with each participant selecting a box and describing its contents to his/her opponent.
The other side then had to guess: Was his/her opponent being truthful?
It was a tense few minutes. Who came out on top? Relive the back-and-forth below:
Elsewhere on The Tonight Show this month...