Episode 151 of "Malcolm in the Middle"
s07e22 Graduation

Malcolm is elected valedictorian of his graduating class and struggles with his speech, but Lois refuses to hear his complaints and reveals her plans for him to become President of the United States. On the opposite end of the spectrum, Reese will do anything to get a permanent job as the high school janitor, even concocting the most disgusting mess of all time, which explodes all over the family. Meanwhile, Hal struggles with Malcolm's Harvard tuition and Francis lands a "real" job working 9 to 5 in a cubicle and enjoys every minute of it. Grandma Ida returns for the family festivities, and they all bid farewell to Malcolm when he leaves for college.