One of my brother's friends (and a friend of mine) who we've been friends with for twelve years came close... he was an alcoholic and a pothead. He'd get drunk and steal cars, do some bad shit. Then he'd get caught and go to jail. After he got of jail, he suffered from depression and his parents wouldn't let him back home. He came to us and we let him stay on the condition that he limited his drinking (which he did), because he's a cool guy with a lot of talent as long as he's sober. But one night, he got a hold of some vodka and drained most of it. Next thing we knew, he broke down our door and started running. My brother and I had to chase him for a good ten minutes, we caught him with a razor in his hand. He swung at my brother once, and I punched him in the face as hard as I could, which knocked him out.
Sounds almost funny right now, but it was one of the worst things I'd ever had to go through. Seeing such a good friend in that state... this all happened near a church and the pastor drove up in a car and gave us a ride home, didn't ask any questions or try to convert us (he really surprised me). I'm sure he could tell our friend was drunk.
He's gone through rehab a few times and he's been sober for three months now, but I'm always worried about him. And I hate worrying.
And Ari, I know what you mean about anger as opposed to apathy.