The woman perks up and says, "How about that? I just ordered a glass of champagne, too!"
"What a coincidence!" John said, "This is a special day for me, I'm celebrating."
"This is a special day for me, too, and I'm also celebrating!" says the woman.
"What a coincidence!" says John. As they clinked glasses John asked, "What are you celebrating?"
"My husband and I have been trying to have a child, and today my gynaecologist told me I'm pregnant!"
"What a coincidence!" says John. "I'm a chicken farmer. For years all my hens were infertile, but today they're finally laying fertilized eggs."
"That's great!" says the woman, "How did your chickens become fertile?"
"I switched cocks." John replied.
She smiled and said, "What a coincidence again!"