Big Mouth and Ugly Girl — Joyce Carol Oates

When sixteen-year-old Matt is falsely accused of threatening to blow up his high school and his friends turn against him, an unlikely classmate comes to his aid.
BIG MOUTH
No I did not. I did not, I did not. I did not say those things, and I did not plan those things. Won't anyone believe me?
UGLY GIRL.
All right, Ugly Girl made a mistake. I'd told mom what I'd heard in the cafeteria, and she'd told Dad. I'd thought for sure they would want me to speak up for the truth.