Klopf Klopf

I came up with a german one (maybe it's funny to those of you who understand a bit of german)
Klopf klopf
Wer ist da?
Bundes
Bundes wer?
SIE SIND REKRUTIERT

I don’t know to many knock knock jokes that haven’t been heard before but I do know a German joke I always loved.
American is visiting all over the world on his stop in Germany he goes to a hotel and as he checks in he asks there is no train near here is there? Seems every where I go I get woken by a train.
The front desk assures him there is no train for miles.
Next day the man is checking out and he is MAD.
He said how dare you lie to me! You told me there was no trains but sure enough 9am and I could here the train right out side my window!
The front desk person thought about it for a moment than laughed and said NO SIR that wasn’t a train that was POLITE German builders they are working on the back wall.
(For those who don’t know
Please = Bitte
Thank you = Danke
Now say those quickly side by side
Bitte Danke Bitte Danke
Lol Sounds like trains on train tracks lol)

"Knock, knock."
"Who's there?"
"It's the police, ma'am. Your son's been hit by a drunk driver, he's dead."
*
Okay, now a real one:
"Knock, knock."
"Who's there?"
"The Doctor."
"Doctor who?"
"Precisely."

Knock knock
Whos there
Europe
Europe who
No you're a poo

-knock knock.
+who’s there?
.
-Alpaca.
+Alpaca who?
.
-Alpaca the suitcase you starta the car.

Knock knock!
Who’s there?
Ach
Ach who?
Bless you!

Why did the chicken cross the road?
To get to the idiot’s house
...
Knock knock
Who’s there?
The chicken!

I have a really good one but someone else has to start it.

Knock knock
Whos there?
To.
To who?
No, "To Whom"

Pretty much the only one I ever managed to remember was this one:
.
Knock knock
- Who's there?
Banana
- Banana who?
Knock knock
- Who's there?
Banana
- Banana who?
Knock knock
- Who's there?
Orange
- Orange who?
Orange u glad I didn't say banana?