“Knock, knock”

“Knock, knock”
He knocks on the door.
He is sweating profusely.
“Is that you?” comes the voice from behind the door.
He is surprised to hear that question and looks pleased.
He feels someone is expecting his arrival.
But it still is a very simple a question to answer.
He says “Yes, it’s me”
The other side of the door is pleased too, because it’s the one expected on the other side.
The door opens.