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The world has a lot of different standards for a lot of things, but I have never heard of a place with the default screw thread direction being opposite.
So does each language have a fun mnemonic?
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Not really a mnemonic in German, but I once learned how to remember of the moon was in first or third quarter by comparing the form of the crescent with the Vereinfachte Ausgangsschrift cursive letters "a" (abnehmender Mond, first quarter crescent) and "z" (zinehmender Mond, third quarter crescent). The same applies to screws watching from the top, cursive "a" is for "auf" (open) and "z" for zu (close). By reading the comments, this is somewhat the closest you get to your mnemonic.
I do not know of one in hungarian.
I just have it in muscle memory to know which way soda bottle cap tightens
The odd left-threaded screws are called Linksgewinde in German. Knowing this, you can sort of figure the rest out.
Aren't left handed threads used when there is torque or rotation that would cause nuts on right handed threads to loosen?
Yes. Bicycle pedals for instance.
I think it's fairly parochial, and sounds quite infantile to me. Growing up (uk) we just used clockwise to tighten.
Have a chat with some plumbers, builders, chippies, sparkys or engineers - assuming you are not one already. I think "leftie loosey ..." is well known in the UK.
