EDWARD NORTON AS AARON STAMPLER IN PRIMAL FEAR (1996)
Sp-sp-sp... It turns out that Aaron, the meek, stuttering altar boy accused of killing the Archbishop who molested him, is actually violent and cunning sociopath Roy, who invents the sympathetic alter ago and a multiple personality disorder to get off on grounds of insanity. What? We tried to call "Sp-spoiler alert!"