iPhone incident on the QF9
The iPhone incident on the QF9 was the result of the phone being crushed as the Skybed was being repositioned from the fully flat position to upright. The phone was charging at the time and had slid down the side of the seat while the pax was sleeping.
While in this case it wasn't the fault of the phone it did show how quickly a lithium battery can turn bad when mishandled/damaged. The cabin crew handled the situation well and the only damage was some slight scorch marks to the side of the seat and a melted headset lead.