If you know the person has the same sense of humor as you, it’s an added bonus. There’s a much bigger chance the person will find the joke funny.

The knock knock joke is also great because it invites the other person to get involved in the joke.

You could say “A broken pencil” is at the door. [2] X Research source You could say “Howl” is at the door. [3] X Research source You might say “Tank” is at the door. [4] X Research source You could say “Boo” is at the door. [5] X Research source

They might say, “A broken pencil who?” They will say “Howl who?” They will respond “Tank who?” They’ll say “Boo who?”

To finish off “A broken pencil” you can respond, “Oh never mind, it’s pointless. “[6] X Research source To finish “Howl” you can say “How’ll you know unless you answer the door?!"[7] X Research source Finish “Tank” by saying “You’re welcome!"[8] X Research source Close “Boo” by saying “I didn’t mean to make you cry!"[9] X Research source

You can try playing with the structure of the joke. For instance, when they say “Who’s there?” reply “Britney. " Then, after they say “Britney who?” repeat the beginning of the joke by saying “Knock knock. " When they say “Who’s there?”, laugh and say “Oops, I did it again!” For example, when they say “Who’s there?” reply “An old lady. " When they say “An old lady who?” you can reply with “I didn’t know you could yodel!” When they say “Who’s there?” reply “Opportunity. " After they say “Opportunity who?” you can walk away and say “Don’t be silly, opportunity doesn’t knock twice!"[10] X Research source When they say “Who’s there?” reply “Interrupting cow. " As they’re trying to reply, can you interrupt them and say “MOOOOOO. “[11] X Research source

When they say “Knock knock,” ask them “Who’s there?” The other person will get stuck now as they didn’t think they’d have to provide the set up for the joke. You can start laughing at this point as you’ve successfully tricked the other person. When they say “Knock knock,” you also say something like, “Come in, it’s open!” which they won’t expect. [12] X Research source

This joke will work perfectly because the first line of Hamlet is “Who’s there?”

“To. " When the other person says “To who?,” correct them and say “Actually, it’s to WHOM!” as this is correct English. “Keith. " When the other person says “Keith who?,” you can say “Keith me, my thweet preenth!” which is just a silly way to say “Kiss me, my sweet prince” in a funny voice. [14] X Research source