The Quick Brown Fox
"The quick brown fox jumps over the lazy dog" is a pangram (a phrase containing all of the letters of the alphabet) that has been used to test typewriters and computer keyboards since the late 19th century. It appeared in Baden-Powell's book Scouting for Boys (1908) as a practice sentence for signaling. In later years, the phrase was popularized by Western Union to inspect Telex/TWX data communication equipment for accuracy and reliability, a procedure known as foxing.
"The quick brown fox jumps over the lazy dog, displaying her vagina" offers a practical yet debatable explanation for the jump.
Yvan Martinez & Joshua Trees for v. issue 6