"I'm Ojo the Unlucky," replied the boy. "I might have known I would fail in anything I tried to do."
"Why are you Ojo the Unlucky?" asked the tin man.
"Because I was born on a Friday."
"Friday is not unlucky," declared the Emperor. "It's just one of seven days. Do you suppose all the world becomes unlucky one-seventh of the time?"
"It was the thirteenth day of the month," said Ojo.
"Thirteen! Ah, that is indeed a lucky number," replied the Tin Woodman. "All my good luck seems to happen on the thirteenth. I suppose most people never notice the good luck that comes to them with the number 13, and yet if the least bit of bad luck falls on that day, they blame it to the number, and not to the proper cause."