Credit: Murray Close/Lions Gate

Move over, George Clooney: there's a new prankster in Hollywood!

While filming the first installment on The Hunger Games in mid-2011, Josh Hutcherson, 19, pulled a fast one on costar Jennifer Lawrence, 21.

"I took a dummy, one that the tracker-jackers were supposed to have attacked, and I put it in Jennifer's bathroom," Hutcherson tells New York Magazine's Vulture. "When she opened the door, she peed her pants. Or so I was told -- she told me later. I did not get visual confirmation on that one."

Hutcherson -- who admits to being a "5-year-old at heart" -- says it wasn't all fun and games on the Hunger Games set. To prep for his role as good-natured Peeta Mellark, he "devoured" the book trilogy before filming began.

The only problem? "I think one of my biggest struggles was getting Peeta to be as strong as possible. He can come across a little soft, because he's admitting his love for [Lawrence's character], and he's sensitive," Hutcherson tells Vulture. "But he's got a backbone. He's got strong beliefs. He's a people person. And we have the same sense of humor."

Hutcherson adds that he doesn't "know what I would have done if I didn't get the part. Wouldn't I be a bad actor if I couldn't play myself?"