My Jazz was rear ended last Sunday. I was stationary in a queue of traffic, heard a screeching of brakes behind and glanced in my mirror to see the car two cars behind get hit from behind, shunting it into the car behind me and subsequently into my car.
The dent in the bumper popped out instantly, but it appears the nearside chassis rail ripped a hole in the rear bumper - that's about an inch from the inside of the rear bumper - and the chassis rail has about half an inch of scuffing but appears to be straight. No kinks in the boot floor/rear, unlike the car that got hit first. I have no idea what damage is behind the rear bumper though.