Makes me think of earlier today.
I was sitting a an intersection on a red light behind another car, with my mate driving behind me.
The light went green and the car infront of me was a bit slow to take off, and as he started to get going a Semi went flying through the intersection!
Just makes me think, I could have just witnessed someone being killed; or had that car not been there, my best mate probably would have watched me get cleaned up by a truck.