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Does each language have "lefty loosey righty tighty"?
(lemmy.world)
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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It depends which bicycle pedal you're screwing in. They have opposite threads, designed where they're self tightening on each side.
If I remember correctly, old timey glass kerosene lanterns also have backwards threads for some reason
Gas threads and water threads are opposites to each other for safety reasons. Might be part of that thought.