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