S2·E14 Substitute's Pet

Wendell subs in Nicholas' class and makes him the teacher's pet. Nicholas' classmates are jealous of the preferential treatment he is getting so they begin to taunt him relentlessly. In order to get back into his friends' good graces, Nicholas plays a practical joke on Wendell. His classmates stop harassing him but Nicholas feels very guilty about pulling the prank. The next day he goes to Wendell and admits he was the one who played the practical joke. He says he only did it so his classmates would stop teasing him. Wendell accepts Nicholas' apology and begins treating him like a normal student, including making him sit in the corner as punishment for his prank.