premise: A sign indicates 'Dangerous Shorebreak' on an overcast day while several people hang out on the beach. hypothesis: The beach is out of water.
contradiction: Dangerous shorebreak implies crashing waves, the beach cannot be out of water if water is crashing on the beach.|contradiction: Shorebreaks cannot exist when a beach is out of water.|contradiction: The beach cannot be out of water if it indicates a  'Dangerous Shorebreak.