Comedy 101, now in its third season, features an in-depth and engaging exploration of the history of knock-knock jokes, examining how this seemingly simple form of humor has endured across generations and cultures. The episode traces the origins of knock-knock jokes from early call-and-response traditions found in folklore and vaudeville to their widespread popularity in the early twentieth century, when timing, wordplay, and audience participation became central to comedic performance. It unpacks the mechanics behind why these jokes work so effectively, highlighting the importance of rhythm, repetition, anticipation, and the delayed punchline in creating humor. The discussion also challenges the assumption that knock-knock jokes are merely childish, instead positioning them as a foundational comedic structure that teaches essential principles such as setup, misdirection, and payoff. By connecting historical context with comedic theory, the episode demonstrates how knock-knock jokes have influenced stand-up comedy, children’s humor, and even modern meme culture. Thoughtful, entertaining, and informative, this installment shows how a joke that begins with a simple knock has continued to open doors to laughter for decades. See Privacy Policy at https://art19.com/privacy and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info.