Perhaps she went to a rural area for a visit. In the morning, she saw a huge cock strutting around. It was much bigger than the ones she had seen before, and that's why she was surprised. The big cock might have had a unique appearance, like very long feathers or a large comb, which caught her attention.
The sudden appearance of an unusually large rooster in an unexpected place, like in her backyard when she wasn't expecting any new animals, could surprise her.
One story could be that a wife living in a rural area was used to small chickens. One day, a neighbor brought over a really big and majestic rooster. When she saw it for the first time, she was quite surprised by its large size and beautiful feathers.
Maybe the stories are about a big rooster that has some extraordinary behaviors. For example, it might be very friendly towards the wife and follows her around the yard all day, which surprises her.
Perhaps it's a story where a 'black cock' is used as a symbol in a cultural or traditional tale. For example, in some cultures, a black rooster might be associated with good luck or protection, and the story could be about how people were surprised by the power of this symbol.
Well, it could also be a story in a magical world. The black cock could be a magical creature with powers that no one expected. It might start using its powers to help the people in a village, and everyone would be surprised by this sudden turn of events. This type of story often teaches us about not judging by appearances and the hidden potential within things.
There was a couple who went on a beach vacation. The wife was wearing a new bikini top. One day, as they were walking along the beach, a strong gust of wind blew. The wife's bikini top got loose and was about to come off. She quickly grabbed it but was still in a rather topless - like state for a brief moment. Her husband was very surprised, and they both had a good laugh about it later. They even took it as a funny memory of their trip.
In a story, the big rooster might have chased away a potential predator from the yard. When the wife sees this brave act, she is very surprised. The rooster, which she thought was just for eggs and decoration, turns out to be a great protector.