What Are the Most Offensive Moments in Django Unchained?

Candie's Phrenology Monologue 1 of 11

Calvin Candie's grotesque speech in which he depicts the flawed reasoning for why an entire race is biologically wired for enslavement is designed to provoke ire. That a population of humans actually believed in such phrenology is unspeakably alarming. Candie intimidates his audiences and uses a skull to prove his lesson, and it's the monologue that every other atrocity in 'Django Unchained' is hinged upon.