Anchor: A man is going for a rebound in an outdoor game of basketball.
Entailed: A man is playing basketball
Contradiction: The basketball is filled with mashed potatoes
Contradiction: I only swim in the winter. 
Contradiction: A group of people are eating some food.
Contradiction: A man is sitting indoors drinking a cocktail.
Contradiction: I took a ride on one of those things once, but never again!