Cosby (1996) : 3x18

Jurnee is aghast when she finds out that her dad intends to date the ""meanest"" teacher at her school. Del is so troubled by Jurnee's reaction to his interest in Ms. Malone that he's ready to call off their date. But Hilton reminds him that almost every person can remember a teacher who was too strict, gave too much homework or expected too much of a student -- and usually ended up being the one who made the greatest impact on the student later in life.