When we're young, it's not hard to get the feeling that we're more or less invincible. While this doesn't mean we think nothing will happen to us if we suddenly cross a busy highway, it does mean that we might not appreciate how fragile our health can be.
While we might take some risks while sowing our wild oats, the scary and unfair part of life is that the biggest problems can sometimes start with the smallest, most innocent-seeming actions.