Billy Bob Thornton and Seann William Scott suffered for their art during a wrestling scene in new movie Mr Woodcock - both suffered severe injuries on the mat.
Scott revealed the wrestling was one of the sequences shot, and neither he nor his co-star in the comedy warmed up enough to avoid injury.
"All of a sudden we're grabbing each other and it was very bizarre," he said. "It was two days of throwing each other around and he was really just kicking my ass.
"I'm not a stunt guy, so I don't know how to go down without being injured, so I came away with a really bad back, and he came away with a broken foot."
"I didn't even realise it was broken. I walked around on it a couple of days and I knew something was wrong, so I finally went to the doctor and he said, 'Hey, your foot's broken."
"He just kind of wrapped it real tight and gave me a bigger shoe and we finished the movie. I didn't take any time off."
Thornton admitted it was not the worst injury he has suffered on a film set, however.
"I've been hurt much worse in movies before," he said. "I've had a broken collar bone, six broken ribs, and a cracked pelvis."