Anchor: An in-line skater grinding on a rail.
Entailed: a skater is grinding on a rail.
Contradiction: The skater is sleeping.
Contradiction: Old men entering the frigid water.
Contradiction: Just because you don't hear about young people doing good a lot, doesn't mean they don't exist. 
Contradiction: Everybody is carrying on their own conversation.
Contradiction: A man flies into the air snowboarding a half pipe.