Malcolm in the Middle (2000)

S5E18 Dewey's Special Class

Malcolm persuades Dewey to intentionally sabotage his performance on an I.Q. test to avoid the embarrassment of being labeled a Krelboyne student. However, Dewey's attempt backfires spectacularly, landing him in a class for emotionally disturbed students. Meanwhile, Hal and Craig find themselves in a fierce rivalry as they compete against each other in a dance competition.