A man in a bar orders a glass of champagne. By coincidence, a lady sitting next to him is drinking a glass of champagne.
Lady: "Quite a coincidence!"
Man: "It's because I am celebrating".
Lady: "Quite a coincidence, so am I. What are you celebrating?"
Man: "I am a chicken farmer, and I couldn't get my hens to produce, but now I have managed it."
Lady: "Quite a coincidence. My hubby and I have been trying for a baby to no avail, but now I have succeeded."
There is a short silence. Then she asks: "How did you manage it?"
The man smiles. "I changed cocks."
"Quite a coincidence," replies the lady.