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In Canada, many people call a 4 litre jug a "metric gallon".

Good golly, now there's a practical, real-world, cultural human unit of measure. Must drive the bureaucrats in Metricland bonkers.

The metric bureaucrats have had to do a few strategic retreats. They tried fining grocery stores for using Imperial measures -- now, pounds and ounces can also be listed on the price sticker. We can inflate our tires in psi, as well as kilopascals (whatever they are). I've gotten used to most things metric -- but not the change from "miles per gallon" to "litres per 100 km". I want to know how far I can go on the gas I have in my tank -- not how much I need to drive 100 km.

The other thing is the meter. It started off being 1 ten millionth of the distance from a pole to the equator. A handy thing for long distance trekkers to know, I'm sure. Now it's something like the distance light travels in a vacuum in 1/299,792,458 of a second. If I'm ever in space, with a good enough stop watch, I'll be sure to check that out.