Canada went onto the metric system around the early 1980s, and so everyone in the country suddenly found that they didn't know how to measure anything. This caused a lot of excitement 34 years ago today, when an Air Canada 767 ran out of fuel half way between Montreal and Edmonton.
You see, people got confused about the whole litres vs. gallons thing, and didn't gas it up enough.
Fortunately, the pilot was a glider ace, and the co-pilot realized that they were within gliding distance of a decommissioned RCAF base that he had been stationed at. They brought the bird in safely, even though there was a car race on the old runway.
And so the moral of the Gimli Glider incident is to make very sure that change isn't just being made because it's a popular change.