A teacher gave an assignment to her students. "Use all the letters in the alphabet and write a word that begins with each letter," she instructed.
The dutiful children completed their task. While grading their work, the teacher's eye was caught by one particular paper. The "A - Apple", "B - Boy", and "C - Cookie" entries were all perfectly correct. She continued through the alphabet until she came to the letter "X". For that letter, the child wrote "Wife".