Amid a New York Times article about a set of quadruplets who were admitted to Harvard and Yale comes this sentence:
Nigel, who wants to study neuroscience, was wait-listed and Zach, who is thinking of chemical engineering, was rejected by Stanford, so perhaps for the first time in their lives, the interests of one is pitted against those of the others.
"Perhaps" the Times writer has never had a sibling or is not the parent of them, or has never read the book of Genesis, which is all about sibling rivalry. And "perhaps" the "fewer editors" policy of the New York Times Company is responsible for the lack of subject-verb agreement between the plural "interests" and the singular "is."