Who invented the knock knock joke?

Two wee chaps

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What idiot invented fire blankets?

You'd think they'd be hot enough from the flames.

Who invented fractions?

Henry the 1/8

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What does Walter White say when he tells a knock-knock joke?

I am the one who Knock-knocks.

What does Walter White say when someone tells him a knock-knock joke?

Nothing, because he is the one who knocks.