"Adcomsubordcomphibspac" is the longest acronym. It is a Navy term standing for Administrative Command, Amphibious Forces, Pacific Fleet Subordinate Command.
"Asthma" and "isthmi" are the only six-letter words that begin and end with a vowel and have no other vowels between.
"Fickleheaded" and "fiddledeedee" are the longest words consisting only of letters in the first half of the alphabet.
"Ma is as selfless as I am" can be read the same way backwards. If you take away all the spaces you can see that all the letters can be spelled out both ways.
"Speak of the Devil" is short for "Speak of the Devil and he shall come". It was believed that if you spoke about the Devil it would attract his attention. That's why when you're talking about someone and they show up, people say "Speak of the Devil."
"Ough" can be pronounced in eight different ways. The following sentence contains them all: "A rough-coated, dough-faced ploughman strode through the streets of Scarborough, coughing and hiccoughing thoughtfully.
"Underground" is the only word in the English language that begins and ends with the letters "und."
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