Margot Robbie in I, Tonya
Margot Robbie has no problem embracing hysteria—see Harley Quinn a la Suicide Squad or Birds of Prey—but she had difficulty portraying Tonya Harding, the figure skater whose involvement with Nancy Kerrigan's assault destroyed her career. Robbie needed weekly MRI scans after herniating a disc in her neck, but Robbie's physical health was far from her main concern. Robbie became so enmeshed with Harding's persona that she had difficulty establishing fiction from reality.