For no Plutonians are Martians. Jennifer is a banker, so Jennifer is respectable, since all bankers are. Whales are large. Whales are mammals. So some mammals are large.
Rainy days are boring, and today is a rainy day.
All mortals are imperfect beings, and no humans are immortals, whence it follows that only non-humans are perfect. He gets a headache whenever it snows, and he has a headache now, so it must be snowing.