Switching letters is called spoonerism. For example, saying "jag of Flapan", instead of "flag of Japan".
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In England, in the 1880's, 'Pants' was considered a dirty word.
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The onion is named after the Latin word 'unio' meaning large pearl.
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The word "gorilla" comes from a Greek word that means "a tribe of hairy women".
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The P.S. at the end of a letter stands for Post Script.
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The dab of toothpaste you squeeze onto your toothbrush is called a "nurdle".
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The word "pornography" comes from the Greek meaning the "writings of prostitutes."
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