6. 'Harold and Maude'
This 1971 black comedy is about the unlikely romance between a death-obsessed young man and an equally morbid woman in her late seventies. The boy's family is obviously horrified by the relationship, and the woman has a secret plan that ultimately solves the problem, but not before all sorts of dark wackiness ensues. A young Elton John was considered for the lead role, but it ultimately went to Bud Cort.