Lost key caused the Titanic disaster
Right before its first (and last) cruise, the captain’s second officer David Blair was replaced by a more senior officer Lightroller who himself was bumped by a very senior crew member from the White Star Line’s sister ship, Olympic. In his rush to depart the ship on 9 April, Blair forgot to leave the key to the crow’s nest telephone and took it with him off the ship. He also seems to have stowed the lookout’s binoculars in his cabin! Lightoller was unaware of this when he took over. This was mentioned to the American Inquiry into the Titanic disaster that they had been unable to find the keys or binoculars.
Mars climate research were ruined because the calculations were in inches
The team that built jet engines for Mars climate research didn’t even think to use the metric system in their calculations and didn’t inform NASA everything was in inches. You can imagine how wrong everything went when they started to build it.
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