Thirty-six years ago on this day was the Gimli Glider incident, where an Air Canada Boeing 767 had to make an emergency, unpowered landing at what had formerly been the Gimli, Manitoba Royal Canadian Air Force Base. The reason for the emergency? Canada had recently gone on the metric standard, and rather than measuring the fuel in kilograms the ground crew measured it in pounds. Since a pound is only about 40% of a kilogram, the plane ran out of fuel in mid flight.
Fortunately for all aboard that day, Captain Pearson was a glider pilot, and glided the plane to a safe landing. Impressive flying.
The only injuries occurred when passengers deplaned. The nose wheel collapsed leaving the aft escape slides unable to reach the ground. Fortunately all the injuries were minor.
In this day of "Everything is an app" this SNAFU is much more likely to occur if we monkey around with basic measurements. People are also less likely to be able to figure out what to do when the computer doesn't give them the answer.