Movies that permanently damaged actors' bodies

Shia LaBeouf in Fury (2014)
Most of Shia LaBeouf's notoriety comes from his exploits when he's not filming, but it turns out he can be just as outrageous on the set. LaBeouf plays a soldier trapped near enemy lines in the WWII drama Fury, and—completely unprompted by the director or producers—he decided to maim himself for the role.