Here R some knock knock jokes!

Knock Knock
Whos There?
Yah
Yah Who?
I didnt know u were a cowboy!

Knock Knock
Whos There?
Luke
Luke Who?
Luke through the keyhole and ull find out

Knock Knock
Whos There?
Boo
Boo Who?
No need to cry, its only a joke!