General Knowledge
Biggest Blunders in History Quiz
The worst decisions, failed invasions, and disasters that changed everything.
The worst decisions, failed invasions, and disasters that changed everything.
In the year 2000, Blockbuster had the chance to buy a struggling little DVD-by-mail company called Netflix for just $50 million. They passed. Today Netflix is worth over $300 billion. That single meeting has become one of the most famous business blunders of all time — but it is far from the only catastrophic mistake in history. From Napoleon's disastrous march into Russia to the engineers who warned about O-rings on the morning of the Challenger launch, history is littered with decisions that seemed reasonable at the time and look baffling in hindsight. This quiz tests your knowledge of 50 legendary blunders across military history, engineering, business, politics, and exploration.
Each round presents 10 randomized questions from a pool of 50, with four multiple-choice options and instant feedback after every answer. Your final score comes with a performance tier and shareable results.
You will explore military disasters from the Charge of the Light Brigade to Operation Market Garden, engineering failures from the Titanic to the Tacoma Narrows Bridge, business catastrophes involving Kodak, Blockbuster, and New Coke, and political missteps that reshaped the modern world. Along the way, you will pick up the surprising details — like the fact that a metric vs. imperial unit mix-up destroyed a $327 million NASA spacecraft, and that a missing comma once cost the US government $40 million.
Many historians point to Napoleon's 1812 invasion of Russia as one of history's greatest military blunders. He marched into Russia with around 600,000 soldiers and retreated with fewer than 100,000. The combination of scorched-earth tactics, brutal winter conditions, and overextended supply lines turned a confident campaign into a catastrophe that accelerated the collapse of Napoleon's empire.
Kodak engineer Steve Sasson invented the digital camera in 1975, but the company's leadership buried the technology to protect its hugely profitable film business. When digital photography eventually took over the market in the 2000s, Kodak had no dominant position in the digital space and was rapidly overtaken by competitors. The company filed for bankruptcy in 2012. It is one of the most studied cases of an established company failing to adapt to its own invention.
The Space Shuttle Challenger broke apart 73 seconds after launch on January 28, 1986, killing all seven crew members. The technical cause was the failure of an O-ring seal on the right solid rocket booster, which had become brittle in the unusually cold temperatures on launch morning. Engineers from Morton Thiokol had explicitly warned NASA the night before that launching in cold weather was unsafe, but managers overruled their concerns. The disaster became a defining case study in the dangers of organizational pressure overriding technical expertise.
Last updated: March 2026