60C? You’re going to die!! 
I recall a humanitarian organization (based in the US, of course) that developed a blanket that, once heated, would stay at just above human body temperature for a long time (it was based on a wax that melted at that temperature). Keeping a constant temperature like that is very valuable for medical treatment of sick infants, and these blankets required very little infrastructure to work, so they could be used anywhere in the developing or undeveloped world.
They designed the blankets with a marker, in color-changing dye, that said “100º”, to indicate when they were warmed up enough. And, unsurprisingly, nobody wanted to put their babies anywhere near the things, because obviously a blanket that hot would kill a baby.
You cannot convert to the metric system, it is not a religion! You are merely asked to adopt it. Like a child. You don’t even have to love it. Just accept that it is better that way. For everyone. It may make you feel good.
Maybe in Great Britain, but surely not on the Continents (the Continents include Europe, Africa, South-America, Asia…). What the Brits call the 12 yard spot, we call the 11 m penalty kick. And so on.
When all the measurements are funny numbers, because they were converted…
The only “funny” number I see is that the goal is 7.32 m wide instead of 8 yards, and it’s not really hilarious. The rest are ranges (like 90 -120 m vs 100 - 130 yd.) and a couple of 5.5. The box is called der 16 Meter Raum in Germany although technically it is 16.5 m, so what? It is measured once (in meters) and the white lines are drawn. In Spain it is called “el área grande” (the big surface) as oposite to the “área chica” (the small surface - 6 yd box). Grande and chica sure are metric units we could agree upon!
Grande and chica are excellent examples of " traditional" or “convenient” non-metric units that we can all appreciate. 
Nice to see we can agree in good spirit 
Looking at the range of measures for the overall dimensions of the field the only really funny thing I see is that it would be technically possible to make the pitch square if somebody took the biggest range for the width (90 m or 100 yd) and the smallest for the length (90 m or 100 yd). Don’t know whether any football field is square, but the rules would allow it.
Also curious that the range for the width is 45 to 90 m or 50 to 100 yd, a 1:2 ratio. But not for international games. (/hijack)
There are lots of archaic units that survive only in their use in some sport. Where does one ever actually encounter furlongs, outside of horse racing, for instance? And the length of a marathon doesn’t make sense in any units (unless you define a marathon to itself be a length unit).
Cite for the separate electrical grids due to the US occupation after WWII.
I’ve always heard it like this.
A cricket pitch is 1 chain long, right? But what do the laws say about someone using an Irish chain or an American chain?
I don’t believe it’s ever arisen, but if anyone tried they would run foul of the fact that although the pitch is in fact 1 chain long, its length is defined in the laws in feet (and metres):
The pitch is a rectangular area of the ground 22 yards/20.12 m in length and 10 ft/3.05 m in width
According to Wikipedia, a chain is 66 feet long (22 yards, as above) in both the U.S. and Imperial units Doesn’t say anything about any Irish units, but I suspect that they’re the same. At 66 feet long, there’s an even 80 chains per mile. And a good point would be that many traditional standard measurements will not go away, whether actually measured in metric units or in whatever other units.
And yeah, hours, minutes, and days are not, it turns out, metric units of time.
The French Revolutionary Republic tried.
You know, for all the talk of hertz, I used to see a lot of older technical documentation referring to cps. To be fair, a lot of this documentation had vacuum tubes and labelled them as valves.
So, err, hertz is metric. Or at least, it’s standard SI.
I measure speeds in Hz per diopter and no one can tell me otherwise.
And also with you.
I don’t understand, but just in case: I am too old to be adopted. And I am not a religion either.
It’s part of the traditional Catholic (and Anglican) Sunday service. The priest says:
“Peace be with you” (or “the Lord be with you”)
and the congregation replies:
“And also with you” (or “And with your spirit”)
You sound religious, despite your protestations. 
Surely it is not only Catholics. Muslims say “wa alaykumu s-salaam” all the time.
And do they reply, “and also with you”?
It’s partly that the phrasing, in English, “and also with you” is slightly archaic, so it’s very recognizable as part of the service. The colloquial way of saying that would be “same to you” or “you, too” or of you wanted to be very formal, “and to you as well”.