I watched Apocalypse Now (this was the initial theatrical cut though I may watch the Redux and Final Cut at some point in the future) and though I thought it was a beautifully crafted and truly hallucinatory and dreamlike, sucking you into it's horrible atmosphere (reminded me a lot of Aguirre, a film I love), I couldn't see any consistient theme in it, and the ending was especially confusing. More @Wikipedia
Hover over any link to get a description of the article. Please note that search keywords are sometimes hidden within the full article and don't appear in the description or title.