This one's a little old, but illustrates how a teenager's sense of invulnerability can result in awesomely brave, selfless acts.

http://www.thegrio.com/news/teen-saves-apartment-building-from-fire.php

We had a student at my school last year who had been our best cross country runner since the 9th grade. He dreamed of being the state champion, but always came in second. Finally, in his senior year, he was running a little behind his biggest rival, biding his time to make his move. As they approached a turn in the course, his rival continued on straight. Rather than take advantage of that mistake, our student Reid called to him and let him know that we was off course. The other runner turned back and eventually caught Reid at the wire. Reid ended up second in the state, but first in everyone's respect. My wife showed me this story today of a similarly principled cross country runner:

http://www.cnn.com/video/?/video/us/2011/09/23/mn-cross-country-runner-rescue.wcco

Teenagers are awesome!