Knock, Knock. Who’s there? Sam and Janet. Sam and Janet who? Sam and Janet Evening. That was one of the classic Knock-Knocks from the prior century. Frank Gilbreth was a fantastic time-and-motion ...

Chances are, one of the first jokes you ever learned started with the world’s most famous opening setup: “Knock Knock.” And while knock-knock jokes have engrained themselves in the American culture in ...