What is the subjective case pronoun in A man makes a silly face one of them?

The subjective case pronoun in the sentence "A man makes a silly face. One of them" is "one".

Here's why:

* Subjective Case: This refers to pronouns that act as the subject of a sentence or clause. They perform the action.

* "One" is the subject of the implied clause "One of them makes a silly face." It performs the action of making a silly face.

Although the sentence is grammatically incomplete, the context implies that "one" is the person making the silly face, making it the subject pronoun.