How to ruin a knock knock joke

[Marthe48]

Knock knock
Who's there?

Come on in!

[PJMcK]

1. Or this

Knock knock.

(Silence)

[Marthe48]

2. Or this

I have a knock knock joke. You start it

[PJMcK]

5. Ha!

I forgot that one!

Have a good week, Marthe48.

[IjustDontlikeRepugs]

3. Interrupting cow is my favorite!

[Marthe48]

4. I know that one!

Thanks to my granddaughter

I like the one where you ask someone very seriously if they'd know you tomorrow? Next week? Next year? And then at some point in the future, say knock knock. When they say who's there, you say "I thought you said you'd know me!" I sneaked it in on several kids. lol

[A HERETIC I AM]

6. Mine;

[IjustDontlikeRepugs]

7. Lol, that's fucked up and funny.

[Annie Moosee]

9. so wrong, it's right!

what is it from?

[ironflange]

8. Here's a fun trick

You: "Wanna hear a knock knock joke?"
Victim: "Sure."
You: "OK, you start."
Victim: "Knock knock."
You (after a brief pause): "Who's there?"
Then you enjoy the look of utter confusion on the victim's face.