Anchor: The Astronomer said, in mild disapproval, "What's this?"  
Entailed: The astronomer questioned what it was.
Contradiction: The astronomer already knew what it was.
Contradiction: Two men walk on the sidewalk as a car passes by.
Contradiction: Two people are making physical contact.
Contradiction: CEOs do a majority of the work in a corporation.
Contradiction: A man is riding a bike with something on his back.