Hey Arnold! (1996)

S3E15 Sid's Revenge

Principal Wartz assigns Sid a detention, mistakenly thinking he was behind the fake vomit incident designed to trip him. Upset by the unfair punishment, Sid decides to take action and crafts a "Revenge Doll" resembling Wartz's face, inspired by tribal traditions. He becomes convinced that his curse has killed Wartz. Meanwhile, Arnold is skeptical, believing Sid is overreacting, even as several eerie signs suggest that something might indeed be amiss with the principal's well-being.