Finally Fertile

A man sat at a local bar and said, "This is a special day, I'm celebrating."

"What a coincidence," said the woman next to him. I'm celebrating, too" she replied, clinking glasses with him. "What are your celebrating?"

"I'm a chicken farmer, and for years all my hens were infertile, but today they're finally fertile."

"What a coincidence, the woman said, for my husband and I have been trying to have a child. Today, my gynecologist told me I'm pregnant! How did your chickens become fertile?" she asked.

"I switched cocks," he replied.

"What a coincidence," she said.