More offensive knock knock jokes.

Knock knock.
Who's there?
9/11.
9/11 who?
YOU SAID YOU'D NEVER FORGET!!

Ok that one is an old one but I like it. Here's a few I just came up with.

Knock knock.
Who's there?
In interrupting muslim.
An interrupting muslim wh..
*BOOOOOOOOOOOOOOOOOOOOOOOOM*

Knock knock.
Who's there?
An aborted fetu..*hack*... ah....
Heh, he's dead now.

Knock knock.
Who's there?
An owl.
An owl who?
...fuck you buddy.

Knock knock.
Who's there?
A native American.
A native American HOW?
...fuck you buddy.

Knock knock.
Who's there?
Carlos Mencia.
Carlos Mencia who... oh fuck it this joke isn't going to be funny.

Knock knock.
Who's there?
About 6 million Jews.
About 6 million Jews who?
About 6 million Jews who probably deserved what we got in WW2.

This offensive knock knock joke in no way represents my personal opinion on Jewish people. It's just an offensive joke.

If you have any good ones, leave a comment.