Anchor: I once studied to be a doctor. 
Entailed: I am no longer studying to be a doctor.
Contradiction: I've never studied medicine in any form.
Contradiction: A rock climber buying equipment.
Contradiction: The roller coaster named GhostRider is located in the Ghost Town.
Contradiction: A man is swimming to the island just off shore.
Contradiction: People want proof of their taxpayer money in use.