What's the best knock-knock joke you've ever heard?!

Question: What's the best knock-knock joke you've ever heard!?
Answers:

knock knock!.
whos there!?
snow white!.
snow white who!?
ive got an apple, wanna feed it to snow white!?!?!?

ROFL
:DWww@Enter-QA@Com

Knock Knock
Who's there!?
Interrupting cow!.
Interrupting co!.!.!.!?
Moo!
"!.!.!.w who!?"

(This is much funnier out loud!.)Www@Enter-QA@Com

ROTLMAO @ CAITABEAR'S JOKE!!!!!
Www@Enter-QA@Com

knock knock
whose there!?
willis
willis who!?
willhisd**kfitinyourmouth!
Www@Enter-QA@Com

knock knock
whos there
tazzer!

retardid police man on youtube hilarouis Www@Enter-QA@Com

Say "knock knock"
"Knock Knock"
Who's there!?
!.!.!.!.Www@Enter-QA@Com

knock knock
whos there
madam
madam who
ma damn foots stuck in the doorWww@Enter-QA@Com

knock knock
who's there
ur mom LOLWww@Enter-QA@Com

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