It's great fun especially when you're trying to work out how fuel efficient your car has been when your tank and fuel pump is in litres and the fuel efficiency is in miles per gallon.
Oh and you'll have a jolly time following a recipe from more than 20 years ago trying to remember what the hell "Gas Mark 4" is in centigrade for fan or convection ovens.
Oh and my personal favourite for the industry I'm in: when designing a PCB your component sizes will use imperial codes, your wire diameters will be in AWG, your track widths and PCB dimensions will be in millimetres, but your copper thicknesses will be in ounces despite the final weight for the assembly will be in grams.
It’s always worth bringing this out again at times like these, while the US trots out the same old excuses for their lack of progress that every other country that used to have old measurements has made.
The UK sorta tried switching to metric but didn't do it completely and now has a weird system where the system you use depends on the situation I hate it
As an American, I use the metric system whenever possible. As of more recently, it's usually taught in schools, as well as used ubiquitously in science. I wouldn't be surprised if the US switches to primarily using the metric system in the next few decades.
For decades, Britain has had campaigners against metric (or the “Napoleonic system” as some of them call it), who were generally on the populist right. There was a grocer who refused to display prices in metric measurements and, when he was fined, refused to pay and was sent to gaol; the tabloids called him the “Metric Martyr”, and lionised him as a hero alongside those who vandalise speed cameras. One of the promises of the Brexit campaign was to abolish the metric system and go back to imperial measures, though after they won, they realised that the imperial measurements have been legally defined in reference to SI units for decades, and establishing a new basis for measurement would be far too expensive and disruptive to do just to placate a bunch of pub bores and opinionated van drivers, so they dropped it.
So Britain has a mixed system (beer and milk are measured in pints, and road distances/speeds in miles, but most other things are metric), only the fluid ounce, which is 1/20 of a pint, is legally defined as 28.4ml or so. Even worse, road distances given in yards (each being around 0.9 of a metre) are actually in metres, going on the assumption that the average person can’t tell the difference. Of course, they can’t call them metres, as there’d be irate letters to The Times and questions in Parliament.