Knock knock joke in Looking for Alaska...?

  • Thread starter Thread starter Rose Pyro Weasley
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Rose Pyro Weasley

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In the book Looking for Alaska, Alaska and Pudge do knock knock jokes. Alaska say this:
"That was brilliant," said Alaska. "I have one. You start."
"Okay. Knock knock."
"Who's there?" said Alaska.
I looked st her blankly. About a minute late, I got it, and laughed.
"My mom told me that joke when I was six. It's still funny."

I really don't understand what the joke is can anyone explain????
 
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