Anchor: The skateboarder does a trick on a ramp.
Entailed: A person does a trick with their skateboard.
Contradiction: Two boys ride their bikes near a lake.
Contradiction: That is not okay in business. 
Contradiction: As a result of too many people.
Contradiction: There is a fee charged for boat watching and as such, it's a costly way to entertain oneself. 
Contradiction: A group of people are listening.