“I have lived on the lipof insanity, wanting to know reasons,knocking on a door. It opens.I've been knocking from the inside.”

“I wonder if rooms in an insane asylum have Do Not Disturb signs for the doors. I should hope not, because knock or no knock, every occupant in those rooms is already disturbed.”

“I’m a door-to-door salesman. I sell doors. If I can’t knock on yours, because you don’t have a door to knock on, I know you’ll be interested in what I’m selling.”

“You have knocked at every door?" she asked."Yes.""Have you knocked at that one there?""No.""Knock there.”

“If I tell you I want to be a door-to-door salesman, don’t knock it.
”

“Knock, Knock!' [Puck] called in a high, singsong voice. For a moment, silence. Then came a thud and a crash, as if something heavy had been hurled at the door. 'Go away!' snaled the voice from within. 'Ah, no. That's not how the joke goes,' called Puck.'I say 'knock, knock', and you're supposed to answer with 'who's there?'' 'Fuck off!' 'Nope, that's still wrong”