2002.09.16
| "Knock knock." "Who's there?""Dwayne." "Dwayne who?""Dwayne the bathtub, I'm dwowning!" | --Earliest knock-knock I can remember. | 
| "Knock knock." 
"Who's there?"
"Death."      "Death wh--URK!" | --via Bill and Li. | 
| "Wanna do a Knock-Knock Joke?" "OK!""You start." "Knock knock!""Who's there?" "...???" | --My Dad got me with this one when I was little kid. | 
| "Knock knock." "Who's there?""Not you anymore." | --Boss in Dilbert using "humor to ease the tension when the workplace is being trimmed." | 
| "Knock knock." "Who's there?""Anxious Cow" "Anx--""MOOOO!" | --High School favorite. | 
| "Knock knock." "Cow with ESP" | --Steve Sian, from a dream he had. | 
| THE WORLD WAR III KNOCK-KNOCK JOKE: "Knock knock." "Who's there?" | --from Middle School... doesn't really work without being from with the title, alas. | 
