Why do people say knock knock?!
Question: cause they dont have a doorbell ;o
Answers: cause they dont have a doorbell ;o
cos the door is already open
to start a joke, duh!
=]
It's part of the joke.
They're pretending they are at someone's door and the other person plays the role of the person inside.
It usually goes:
Knock knock.
Who's there?
"Who's there" referring to the person on the other side of the door.
Get it?
who's there
Because they want you to answer the door!
It's a part of the knock knock joke..it completes it..
It is the starting of the joke..............