Who's there?
Major.
Major
who?
Major laugh.
Who's there?
Cook.
Cook
who?
Hey! Who are you calling cuckoo?
Who's there?
Doorbell Repairman.
Doorbell Repairman
who?
Ding Dong! My work is done here.
Who's there?
Impatient Pirate.
Impatient Pirate
wh-
ARRRRRRRR!
Who's there?
Police.
Police
who?
Police hurry, I'm freezing out here!
Who's there?
Nun.
Nun
who?
Nun of your business!
Who's there?
Doctor.
Doctor
who?
You've seen that TV show too?
Who's there?
Police
Police
who?
Police, can I stop telling knock knock jokes!
Who's there?
Usher.
Usher
who?
Usher wish you would let me in!
Who's there?
Diploma.
Diploma
who?
Diploma is here to fix the sink!

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