Anchor: A boy in a yellow shirt walks with his surfboard out of the ocean.
Entailed: The boy is done surfing
Contradiction: The boy is not active
Contradiction: He could get hurt, and I hope he hurts others. 
Contradiction: If you're of no use to anyone, why are you here?
Contradiction: Several young people are sitting.
Contradiction: A boy and girl are sitting near a lake.