ROBERT DOWNEY JR. AS JULIAN WELLS IN LESS THAN ZERO (1987)
Robert Downey Jr.’s portrayal of Julian is notable for being the first time most moviegoers saw a white dude smoke rock (or turn tricks to get high). Despite his good family and privilege, he destroys all his relationships because he just can't kick the habit. You see, kids, not all junkies get to rebound and star in Iron Man.