A: The knocking always speeds up.
Canon open the door then
ANSWER: Because he's afraid someone would look through the keyhole.
He already told you so.
They know their knots.
Because she had no arms. "knock knock" "whose there?" "not sally!"
Because a black ball knocks over white pins with red necks.
Need for speed.
Quit Russian.
Because he had the doldrums.
Drummers.