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Except when you have a left hand threaded screw.
That expression has never made sense to me. How does it make it easier to remember which way to turn things when it isn't clear which way is right and left? How does one turn a circular object right or left? It makes no sense.
Upon visiting my grandmother's place and seeing her's rotate what was in it totally blew my mind.
EDIT:
It goes both ways. After four tries I observed it go clockwise first, on second counter-clockwise, on third clockwise and on fourth counter-clockwise. Intriguing design.
It's a mnemonic. It's like a clock. Is the screw rotating left or right past the 12 o'clock position.
Counter-clockwise in the States.
If you're talking about toilets this isn't true. The Coriolis effect is negligible at small scales like this. The way the water swirls is nearly entirely dependent on the design of the toilet. Outside of toilets with whirlpools and whatnot the direction is mostly influenced by the direction of water currents and waves etc. as it forms. Even tornadoes don't always rotate in the direction they "should" depending on what hemisphere they are in, though they usually do as they are at a large enough scale to be significantly affected by the Coriolis effect.