Why does joey from joey pigza swallowed the key get sent to the princible?

In "Joey Pigza Swallowed the Key," Joey is sent to the principal for an incident that occurs during class. He struggles with attention and impulsivity due to his ADHD, which leads him to act out inappropriately. Specifically, he swallows his house key as a way of coping with his frustration and overwhelming feelings, prompting his teacher to send him to the principal's office for his disruptive behavior. This incident highlights the challenges Joey faces in managing his condition.