throw life away

You can't save everybody. Heck, life is a constant battle in saving oneself. And because most of us relish every opportunity life gives us, or at least try to make the most of it all, it's disheartening when we see others squelch all the chances they are given. It's always most sorrowful when it's those who are blind to their own awesome potential.

Redditor u/ghettoterrorist wanted to hear how some have been most disappointed by others by asking.... What is the most stunning way you've seen someone throw their life away?