The latest rough handling comes from Jailbreak nation, which appears to be the latest in a series of sites to get its hands on the rear shell of what is almost certainly the backside of Apple's next iPhone. It's by no means the first, but has maybe gone the furthest to test how durable Apple's latest gold color holds up to some extreme abuse.
That takes the form of a knife scratch test, which scrapes up the back of the purported iPhone 5S to show how it holds up to cosmetic damage. Notably the test does not cover drops, something that could crack your screen, and possibly lead to a nonfunctional device.
You can watch the whole clip below: