If only humans had 6 fingers on each hand…
;-]
Well, a dozen would make more sense than it does!
If you use kilograms for mass, meters per second for speed, you will get energy in joules.
If you use slugs for mass and ft per second for speed, you will get ft-lbs of energy.
Can you imagine the chaos that would result if we could not get 4’ X 8" building panels?
We’ll probably keep the 4’x8’ building panels and rename them 122X244 cm panels.
OK, so that means studs will be every 40.6666 . . . cm instead of 16"? Stock tip: Buy tape measure stock.
40.64-cm, actually. I don’t just put the studs on 40-cm centers. Can o corn.
??? 
Can o corn = it’s as easy as preparing a can of corn to eat. Put in a dish and microwave it. Ready to eat. Actually the saying predates microwaves. In the olden days, we dumped the can of corn into a pot and heated it on the stove. Still easy.
Or put it on the manifold to eat on the road. But who wants to eat a whole can of corn on the road? When I was a kid we’d go directly to the canning factory and buy a case of corn and a case of peas for about a dollar a case. Only problem was they were not labeled yet so you had to make sure you labeled them so you didn’t get peas when you wanted corn. (I was the only one in the family that didn’t put in a night shift at the canning factory during their pea and corn packs. I was just determined I was not going to do that. Even my Grandmother did. No one in my family still living will to this day eat cream corn.)
So they still like it? (Double negative.)
;-]
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Well I don’t want no fried corn and I don’t want no fried corn right now… And I don’t want no corn bread either.
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I recall working on old MGs long ago and needing a 27/64" wrench that was the fractional equivalent of some odd sized Witworth. Back then Sears stocked the 3 or 4 combination wrenches that had no equivalent size in an SAE set.
Remember that scene in the “Aliens” movie when the Ripley character gets mad and knocks over her plate of food, and one of the marines remarks that it appears as if she also doesn’t like her corn bread 
I think it was a 17/32 that worked out fine for a 14mm. We don’t need no stinkin metric sockets, Course if I hadn’t lost my 14mm I would never know.
I needed a 23mm socket for a nut on my planer. They had 22 and 24 but for some reason 23 was hard to find. I don’t know why since anyone that has a DeWalt planer needs a 23mm. I did find one at the farm store for only $6. They had one-hiding.
DeWalt did that so you had to buy the 23-mm socket from them. They are part of the SBD conglomerate, you know.
A 15/16 might work, but it will be a little loose on a 23 mm nut, a 7/8 will be a little too small. It’s a shame metric nuts don’t come in sizes like 22.225 mm or 23.81 mm. Then we could rename our 7/8 and 15/16 inch wrenches “22.22 and 23.81 mm” wrenches and the whole world would be happy.
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Odd tools. I was replacing the hubs in my Silverado this morning and the difficulty enhancement engineers at GM selected a penta head allen screw to hold the vehicle speed sensor in. None of my hex head allens wrenches SAE or metric would fit so I jammed a 1/4" flat blade screwdriver in it and unscrewed it that way.
I noticed there aren’t any metric flat blade screwdrivers. I guess my 1/4" flat blade would be a 6.35 mm flat blade.
All my tire irons are metric. I do prefer that my jackstands be in inches. My old Japanese bikes have screw heads that are JIS, but look like Phillips. until you strip them.
And why isn’t there a monument to Henry Phillips? Or Charles Moncky, the wrench guy? Or Albert J. Dremel?