Watch: Jennifer Lawrence and Jimmy Fallon face off in "Box of Lies"

Jennifer Lawrence and Jimmy Fallon on "The Tonight Show Starring Jimmy Fallon," May 15, 2014. NBC

Who's the better liar? Jennifer Lawrence or Jimmy Fallon?

The two faced off in a game of "Box of Lies" on "The Tonight Show Starring Jimmy Fallon" on Thursday. The rules? Each would select a box -- without the other one seeing -- and then say what's in the box. They could either tell the truth or make up its contents, and the other person had to guess if it was a truth or a lie. Sounds pretty simple, right? But in reality, it was pretty hilarious.

Lawrence chose a box and said it contained a Rubik's cube inside Jello, and Fallon picked up one he said contained a Backstreet Boy action figure surrounded by Hershey's Kisses. Were they truths or lies?

Check out the video below to find out. You'll probably chuckle along the way:

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