a day for knock knock jokes

Knock Jokes have been around for many years. The earliest knock jokes include:

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1929:  The game of Buff – A child with a stick thumps it on the ground using the following dialogue:
Knock Knock
Who’s There:
Buff

What says, Buff:

Buff says Buff to all his men, and I say Buff to you again.

1934:  The standard knock knock joke format was used in a newspaper humor column:

Knock Knock
Who’s There?

Rufus
Rufus Who?
Rufus the most important part of your house.

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It was in the mid 1930's that the knock knock joke gained popularity. It was The Rowan & Martin's Laugh in Show that appeared in the late 1960's - 1970's that helped bring even more popularity to the knock knock joke.

Here is an easy one to start and then you can grow on them learning your own: