It should go without saying to mind where you set your straps when you are loading your rig. The odds of anything really bad happening are probably slim to none. The thing is that bad things can and will happen when you aren't paying attention. Its easy to forget that spinning drive shafts are dangerous. Its also easy to forget that there is one of those spinning devils right underneath you while you are driving down the road. Check out the pictures of this poor souls truck.
I believe what happened here is a strap was draped over the headache rack and left to hang. While going down the road the strap came in contact with the spinning driveshaft and then the carnage ensued. The ratchet strap once pulled short enough and with the hook still on the end of it beat a large hole in the fuel tank and into the exhaust pipe. Once all the fuel drained out the driver is now stranded. So do yourself a favor and make sure all your straps are packed away in a toolbox or behind your seat, at the very least packed safely away from spinning parts!