I'm In A Glass Case of Emotion
I made myself sit through this five minutes and seven seconds of pure emotional turmoil, and now I'm passing it on to you. Via the miserable sadists at Movie Miscellany, here's a montage of the 100 Most Depressing Movie Death Scenes. Some of them are legitimately heartbreaking (ARRRTAAAAAX!). For others, your narm mileage may vary. Some of the deaths aren't really geared toward being depressing at all, like that of Marion Crane in Psycho, which is more of the bone-chilling variety. And there are a few particularly tragic examples missing (Littlefoot's mother from The Land Before Time, for example. And any of Sean Bean's many, many deaths, which the video description acknowledges).
Still. Something tells me that you'll need to see something chipper and uplifting after watching this. Here, have a baby kangaroo.
Now excuse me while I try and stave off The Iron Giant feels.