The idea of walking past a freezing homeless child and doing nothing seems's not. 

This social experiment video was heartbreaking to watch, until a generous passerby changed things.  Even more incredibly, this passerby could relate to the situation the boy found himself in.

I was struck by how we can all be so lost in our own world that we miss the chance to help someone in need.  In addition, it's amazing to see how others can notice something once one person stops just walking by and engages.