This is a story from a book I never thought I'd read:
A man and his girlfriend was walking along the road, when they heard a sound in the distance from the bushes.
The girl looked towards the sound and said, "It's a chicken."
The man, caught surprised, replied, "It's a duck, honey."
"No, it's a chicken," his girlfriend insisted.
"Listen! That's a duck! Chickens go cluck cluck!" explained the man.
"But it's a chicken," said the girl once more, her brows frowning this time.
This made the man lose his temper, and he stopped walking, let go of her hand, turned around and looked her in the eye.
"That is obviously a duck! D-U-C-K!" he raised his voice.
To which the girl cried, and the man finally knew that he was wrong.