This is one of my favorite films. It's surprising that it's one of the funniest, though. I laugh my ass off every time I see it. But, I usually get strange looks when I do lol.
From the page: "Harold and Maude is a movie directed by Hal Ashby in 1971. The film features both dark and light humor, social satire (including anti-war), promotes the notion of living life to its fullest, and has long had a cult following. The film is number 45 on the American Film Institute's list of 100 Funniest Movies  and number 42 on Bravo's 100 Funniest Movies. In 1997, it was selected for preservation in the National Film Registry of the Library of Congress."