Samsung Galaxy Note 7 (2016)

The Samsung Galaxy Note 7's battery flaw caused the phone to literally explode in users' pockets, leading to an unprecedented global recall and a $5.3 billion loss for Samsung. This catastrophic failure was so severe that the device was banned from all commercial aircraft, turning it into a worldwide cautionary tale. Compared to the #3 Apple Maps disaster, which suffered from embarrassing mapping errors, the Note 7's safety hazard was far more dangerous, resulting in a permanent scar on Samsung's brand reputation.