"Say It Ain’t So, Joe"

In 1949, a boy named William Bennethum wrote to "Shoeless" Joe Jackson asking him for his autograph, but because Jackson was illiterate, he was unable to honor the boy's request.
A year later, after Jackson's death, the letter from Bennethum was found among Jackson's belongings in its original envelope. Jackson had signed his name on the back of the envelope twice, and had attempted a third signature. These signatures are among a very small number of actual Jackson signatures that exist.
In 1998, the then 62-year-old William Bennethum said that he remembered writing the letter to his hero, and that he had received an autograph back, not Jackson's, but, instead, from Jackson's wife Katy. She had always signed for him.