Switching letters is called spoonerism. For example, saying "jag of Flapan", instead of "flag of Japan".
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Longest officially recognized place name is Taumatawhakatangihangakoauauotamateapokaiwhenuakitanatahu.
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A “butt” was a Medieval unit of measure for wine. Technically, a 'buttload' of wine is about 475 liters, or 126 gallons.
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Shakespeare invented over 1,700 words that we use today.
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A group of pugs is called a grumble.
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The word "impossible" dropped in use by 50% over the course of the 20th century
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