Switching letters is called spoonerism. For example, saying "jag of Flapan", instead of "flag of Japan".
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The onion is named after the Latin word 'unio' meaning large pearl.
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The longest word in the English language is pneumonoultramicroscopicsilicovolcanoconioses!
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A legend suggests that clans of long ago that wanted to get rid of their unwanted people without killing them used to burn their houses down - hence the expression "to get fired."
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Q is the only letter in the alphabet that does not appear in the name of any of the United States!
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The dot over the letter 'i' is called a tittle.
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The distress code 'Mayday' comes from the French for help me, M'Aide!
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Thinking in a foreign language makes decisions more rational.
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