Jennifer Lawrence almost killed someone by scratching her butt

Jennifer Lawrence says she almost killed her sound man when she scratched her butt on set. (Reuters)

Some itches just shouldn't be scratched.

Jennifer Lawrence learned that the hard way. The Passengers star revealed on The Graham Norton Show that she once almost killed her sound guy -- by scratching her butt.

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"We were filming in Hawaii, and there were sacred rocks," the 26-year-old actress shared. "You're not supposed to sit on them."

"I however, was in a wetsuit... Oh, my god they were so good for butt itching," Lawrence added, which is precisely the moment everything went wrong.

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"One rock ... ended up coming loose," she explained. "It was a giant boulder, it rolled down this mountain, and almost killed our sound guy."

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Thankfully, everyone is OK!

Meanwhile, Lawrence's "Passengers" co-star, Chris Pratt, has been doing a bit on Instagram lately, where he shares pics of himself with Lawrence cropped out of them.

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"The Graham Norton Show" airs on Saturday, Dec. 10 at 10 p.m. ET/PT on BBC America.