"Hello?" joke

So I have this great knock knock joke for you!
Knock Knock
Who's there?
Hello?
Hello who?
Hello?
Hello who!!?
Oh Hi?
Hey, I have this great knock knock joke for you!
Okay knock knock.
Who's there?
Hello?
Who's there!!!??
The door slams.
Knock knock. Ding Dong.
Fine.
Hello?
Hello?
Hello!!!?