Any fans worried if Jennifer Lawrence will be able to bring the appropriate level of toughness to her role as Katniss Everdeen in "The Hunger Games" -- opening in theaters nationwide this Friday, March 23 -- needn't fear. She managed to give co-star Josh Hutcherson a concussion, and the cameras weren't even rolling according to the story he told David Letterman on "Late Show" (Weeknights, 11:35 p.m. ET on CBS).

According to Hutcherson, the two of them were just palling around on the set when things took an unexpected turn. "We were just goofing around, and like doing some shadow boxing for fun ... as one does," he said with a laugh. "She throws this beautiful kick, but it landed right on my temple and literally knocked me to the ground and I was down."

They didn't realize how serious the injury was at the time, but it turned out she'd given him a concussion, which he downplayed to continue filming. "The next day somebody asked me for my address and I started telling them my address from when I was nine years old," he said. "That's when I was like, This is not right."

Understandably, Lawrence immediately felt terrible about it. Hutcherson described himself holding an ice pack on his head in one hand while rubbing her back and trying to tell her that it was okay with the other. One thing's for sure, though, Lawrence can clearly take care of herself if she had to.

"The Hunger Games" opens nationwide on Friday, March 23. "Late Show With David Letterman" airs weeknights at 11:35 p.m. ET on CBS.

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