Anchor: Men skateboarding down a hill with helmets on.
Entailed: Men riding skateboards with helmets on.
Contradiction: Men riding a bicycle down a hill.
Contradiction: A boy is not watching TV even though he has it on.
Contradiction: Three people are playing a game of monopoly.
Contradiction: I won't make any attempt to hold on to this. 
Contradiction: The firm came out of the fiasco in better condition.