Marlon Brando in The Men
Taking method acting too far yet again, previous to the filming of the movie, Brando spent weeks living in a Veterans hospital, assuming the identity of a veteran and living as a paraplegic.
Much like Daniel Day Lewis in My Left Foot, Brando refused to leave the wheelchair between takes and stayed on it off-set during the months of production. Eventually, he confessed his identity to the real veterans in the hospital, as they became close friends during the time he spent there.