Topic, Knock Knock Jokes

  Sorry for the spam, but would you like to post knock knock jokes for fun?

Rules V2.5: (UPDATED, IMPORTANT! If you are to the topic, then please Read the rules first)
Person A: "Knock Knock!"
Person B: "Who's there?"
Person A: "X" EXAMPLE: X=Tacker
Person B: "X" who?
Person A: "Y" [Y = final answer here]
{"Joke ends"}
BTW, NO DOUBLE-POSTS...