Anchor: A surfer riding a surfboard in rough seas.
Entailed: A surfer is in the water.
Contradiction: A surfer is sitting on the beach watching the waves.
Contradiction: Carp streamers are not allowed during this festival in Japan.  
Contradiction: Nema let out an excited squeal of delight. 
Contradiction: I know for certain that all cans are recyclable. 
Contradiction: By the time the work stopped, only the 18ft tall portal had been completed.