Malcolm in the Middle (2000)

S7E16 Lois Strikes Back

After four popular girls at school pull a cruel prank on Reese, claiming he has a secret admirer and leaving a pig at his doorstep, Lois steps in to defend him. Determined to get back at the girls, she devises a plan that turns their lives upside down. At the same time, Hal notices that Lois is in a precarious emotional state and decides to give her some space. In the process, he discovers a creative way to build his own pitching machine using materials he finds in the garage.