Jennifer Lawrence stopped by 'The Tonight Show Starring Jimmy Fallon' last night (May 15), and as you might expect, putting the hilarious actress and the outrageously funny host in a room together produced some pretty amazing results.

When Lawrence and Fallon sat down to have a nice chat about J. Law's new movie, 'X Men: Days of Future Past,' first they had to clear the air about an embarrassing moment they had with Jennifer Lopez.

"Okay, we came up with this idea together, first of all," Lawrence said. "This was like 10 Jello shots in … And so we were dancing, and we see J. Lo, and [we're like] we should ask J.Lo to dance!"

"What we'll do is, we'll do a spin, and then go 'Dance with us!'" Lawrence said of the carefully choreographed routine that she and Fallon planned to do -- but all did not go according to plan.

"Basically, I do it, and then I go like this," Lawrence said, twirling. "And he's gone, and it's just me, looking at J. Lo, going 'Dance with me.'"

"And she's just like, 'No, no … I think I'm just going to observe,'" the 'Hunger Games' actress continued. "You made me look like a freak in front of J. Lo! Oh my God!"

Of course, Fallon had a reasonable excuse: he happened to spot Lopez's manager in the crowd, who quickly shook his head "no" when he saw what the two were planning to do. But embarrassingly for J. Law, Fallon ducked out without telling her. Yikes!

However, the two soon made up and played Fallon's 'Box of Lies,' a game where odd objects are hidden in boxes and one person has to either tell the truth about what's in his box or make up a lie, and the other person has to decide if he is bluffing or not. Of course, the boxes were filled with some amazingly strange things like a 'Full House' Uncle Jesse doll, a cannoli in a bird's nest and a Rubiks cube in Jello. But even better than the actual objects themselves was the banter between Fallon and J. Law, a description of which wouldn't even do it justice.

Watch them play 'Box of Lies' in the video below!