Over 11% of all Americans are infected with parasitic pinworms, which make your ass itch at night when they come crawling out of your anus to lay their eggs. As the worms deposit sticky eggs on the skin, the itching makes you scratch and smear those eggs across your fingers. The contamination then spreads to whatever you touch, often including your own breakfast. When you swallow the eggs, the pinworms reinvade your gut and repeat the infection cycle all over again.
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