Anchor: A person surfing.
Entailed: There is a person who appears to be surfing.
Contradiction: The person is sitting by the beach.
Contradiction: I have all of the time in the world because I am childless. 
Contradiction: I looked out the window and it's kind of foggy tonight.
Contradiction: A boy is swimming in the ocean.
Contradiction: Most people don't like the modern building, but it's still open for free tours.