In a new interview with British GQ (via The Independent), Logan revealed that Shia actually took a knife and cut up his own face to make his war wounds more realistic.
"They [makeup artists] were putting cuts on Shia and I said, 'Yeah, yeah, it looks good,'" Logan said. "And Shia was like 'No, it doesn't look real.'"
But nothing could prepare him for what happened next.
"He walks out into the hallway and says, 'Hey man, wanna see something fun? Check this out…' and he takes out a knife and cuts his face," he recalled. "For the whole movie he kept opening these cuts on his face. That's all real."
In May, Shia's A Guide to Recognizing Your Saints co-star Channing Tatum also recalled his extreme on-set antics -- which included the two acting like "eighties hoodlums."
"Me and Shia, I think we had just met that day. We were, like, 'What shall we go out and do?' We were drinking. And I think our initial thing was 'Alright, let's go out and try and get in a fight.' This was just young dumb idiot actors thinking that that's going to bond us," Channing told GQ. "I think Shia even punched a cop car -- we weren't even sure if the cop was in the car, he punched the window of a cop car. It was pandemonium. It was just one of those nights that the volume just keeps getting turned up, turned up, turned up."
"I've never seen him since then," he added. "The kid's an incredible actor…I just wish that he would just act. Just act, man!"