The sentence <em>My little brothers like to watch "The Peppy Pirates” on TV, and they drive me crazy</em>! contains a vague pronoun.
Explanation:
As a general rule, <u>pronouns</u> should clearly refer to one unmistakable noun. <u>Vague pronouns</u> are those pronouns that do not have a clear noun antecedent and trigger misunderstanding in the reader. The pronoun <em>they </em>in this sentence is not clearly linked to neither <em>my little brothers</em> nor <em>"The Peppy Pirates," </em>so it could be easily considered a vague pronoun.