In his short story collection Night of the Cooters, Howard Waldrop writes in the introduction to his Wild Cards shared universe story "Thirty Minutes Over Broadway!" about a phone call he received from Roger Zelazny:

About a month later the phone rings.
"Yo!"
"Roger Zelazny."
"żEn que puedo servile?"
"What day was September 15, 1946?"
"Tuesday."
"Sure?"
"Certainement!"
"Okay." Click bzzzzzz

I was certain September 15, 1946 was Tuesday, because that was my birthdate. I like the idea that the world changed forever the day I was born. I was always told I'd been born on a Tuesday. Roger needed to know this because his story takes place just as mine is ending, and he wanted to make sure it was a weekday, because his kid-character Croyd is walking home from school, and Tuesday is perfect for that. (After the book came out, someone came up to Roger at a convention and told him for real and true September 15, 1946 was a Sunday and showed him a calendar. Roger said a naughty word, took his ever-present pipe from his mouth, and threw it down, breaking it. I owe Roger a pipe.)