With goofballs like Chris Pratt and Jennifer Lawrence present, there were many fun times to be had on the Passengers set.

Pratt and Lawrence had a lot of fun on the set of Passengers, their new sci-fi blockbuster coming out in theaters this Christmas. Their antics apparently reached such a point that director Morten Tyldum had to refocus them, according to the stars themselves.

"There were times where we really should have given Morten a break," Lawrence told People Wednesday. "We were all in this together trying to finish this movie, and then we turn Morten into the principal [on the schoolyard]. But yeah. We probably got in the way a couple times."

Pratt agreed, noting that they had to be "shushed" at times, but ultimately, "we had a lot of fun. We were laughing a lot. She's better at switching immediately from goofball mode into serious acting mode, so sometimes I had to kind of shut it down and kind of go inward to get there. She just kind of turns it on and off real quick. So yeah, we got in a little trouble - but not too much."

Tyldum, who was nominated for an Oscar last year for directing British period piece The Imitation Game, suggested that their antics actually helped balance out the relative seriousness of the film.

"There's a lot of big emotional scenes there, and I think to have that levity, to have that playfulness ... You can't be a whole day and go into a day like 'Today I'm going to hate you,' and 'Today I'm going to have a breakdown.' You can't go around in that dark cloud all day, so they need this lightness, to have this fun," Tyldum said.

Passengers is set for release in theaters on Dec. 21.

Tags: chris pratt Jennifer Lawrence Passengers