Samsung Galaxy Note 7

Samsung's 2016 flagship literally caught fire. Not metaphorically — the batteries had a manufacturing defect that caused thermal runaway, and phones were exploding in people's pockets, on nightstands, and on airplanes. Samsung recalled 2.5 million units, then the replacements also caught fire. The FAA banned them from flights. Samsung lost an estimated $17 billion. "Note 7" became shorthand for catastrophic product failure across every industry.