Well you know how the story behind the song is about the kid Jeremy who shot himself in front of his English class? The video basically sets up a scene with a very distressed child (obviously Jeremy), and throughout the song, you see images of him shouting, showing physical anger, getting his parents attention, kids making fun of him at school, etc.
Then at the end, you see him come into his English class with a gun behind his back, and as the song ends, he shoots himself. (You don't see it, but you know what's happening) And right at the end shots are taken of the children in his class covering their hands over their faces with blood from him on their shirts.
It's a really awesome video, and really captures the meaning of the song, even though the video isn't real, for me it personally put a whole new feeling into the song.