The P.S. at the end of a letter stands for Post Script.
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Beelzebub is Hebrew for 'Lord of the Flies'.
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The dab of toothpaste you squeeze onto your toothbrush is called a "nurdle".
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In England, in the 1880's, 'Pants' was considered a dirty word.
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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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The phrase 'rule of thumb' is derived from and old English law which stated that you couldn't beat your wife with anything wider than your thumb.
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Switching letters is called spoonerism. For example, saying "jag of Flapan", instead of "flag of Japan".
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