While the man savored a double martini at the local bar, an attractive women sat down next to him.

The bartender served her a glass of orange juice.

The man turned to her and said, "This is a special day. I'm celebrating."

"I'm celebrating, too," she replied, clinking glasses with him.

"What are you celebrating?" he asked.

"For years I've been trying to have a child," she answered, "Today my gynecologist told me I'm pregnant!"

"Congratulations," the man said, lifting his glass. "As it happens, I'm a chicken farmer, and for years all my hens were infertile. But today they're finally fertile."

"How did it happen?" she asked.

"I switched cocks."

"What a coincidence," she said, smiling.