http://gizmodo.com/why-screws-tighten-clockwise-1639456879

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Screw is a funny word.

Since at least 1725 it has meant to copulate, and since 1900 it has meant to cheat or defraud.

“To screw up” dates from 1942, while not having your head screwed on right has been an expression since at least 1821.

The screwdriver cocktail traces its roots to 1956, and the screwball as a pitch to 1866, while as a person to 1933.

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Laughing!

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