Exploding iPhone 4

While there’s still some debate about whether an iPhone’s Wi-Fi signal is an in-flight hazard, an exploding iPhone certainly seems like one.
On a regional flight from Lismore, Australia to Sydney, a passenger’s iPhone 4 “started emitting a significant amount of dense smoke, accompanied by a red glow.”
A flight attendant was able to extinguish the overheating phone, and the plane finished landing successfully. The iPhone 4 was taken by the Australian Transport Safety Bureau, and the cause of the explosion is still undetermined.
Similar incidents occurred in 2009, but they weren’t widespread, and Apple chalked them all up to “external pressure.”