Switching letters is called spoonerism. For example, saying "jag of Flapan", instead of "flag of Japan".
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The word "impossible" dropped in use by 50% over the course of the 20th century
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"Goodbye" came from "God bye" which came from "God be with you."
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The word 'mortgage' comes from a French law term that means 'death pledge'.
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Iceland has been so culturally isolated through history since the Vikings, that compared to other Scandinavian counties, people who speak Icelandic can still read the old Norsk sagas.
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The distress code 'Mayday' comes from the French for help me, M'Aide!
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Hoover vacuum cleaners were so popular in the UK that many people now refer to vacuuming as hoovering.
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