Anchor: As Melville pointed out, if a sperm whale can spend more than an hour swimming at depths of up to 6,000 feet, and a sperm whale is composed mostly of gas (air-filled lungs and blubber), then Boyle's law would dictate that, as Spruch puts it, a whale of regulation size at the surface should, at the pressures a thousand fathoms down, decrease its volume to the size of a bathtub!
Entailed: A sperm whale can go to 6,000 feet easily.
Contradiction: A sperm whale can only go to 2,000 feet.
Contradiction: Section 300 of the Communications Act allows this rule. 
Contradiction: The leaders of the Revolution declared the palace a national museum.
Contradiction: A woman is jogging.
Contradiction: someone is working in hot weather.