Boyhood. Have you seen it? If not, put down the laptop and do it right now.
It's my favorite new pop-culture of the year, and its whole shtick is ambiguity - you can't really be driving toward a specific revelation when you're filming over the course of 12 years with actors who are growing up and out while the world changes around them. What you're driving toward, in this case, is a portrait of the ambiguity of growing up.
Giving away the ending isn't giving away much. A smart kid gets to college and does some mushrooms with a girl who's nice to him and some new friends who make him feel easy. That could describe Steve Jobs, the Son of Sam or Michael Phelps. That's the beauty of the ending - you get to see this real kid grow up, strong moral center, socially awkward, disdain for heavy substance abuse, a taste for substances. You turn that kid loose in the desert with a pretty girl, apparently good-hearted friends and a bag of shrooms? You tell me how that's going to end up.