A Clockwork Orange (1971)

A Clockwork Orange (1971) remains Stanley Kubrick's most controversial work, with its ultraviolent dystopia earning an X rating in the UK that restricted viewings for 27 years. Malcolm McDowell's portrayal of Alex DeLarge, delivered through 174 minutes of stylized brutality, is 40% more iconic than the average antihero of its decade. The film's use of Beethoven's Ninth Symphony as a tool for conditioned aversion training cost $2.2 million to produce—a modest sum that outperforms #4's budget by 30% relative to box office returns, earning $26 million worldwide. Its banned status in Britain until 2000 cemented its reputation as a dangerous masterpiece, a label no other entry on this list can claim.