Knock Knock jokes are every bit Folk as songs.

Their origins and variation (as in Folk process) are folklore.

And let it be recorded this is the first time I would argue against a Joe Offer proclamation. Oooer.

I used to do light bulb jokes at a Folk Club and no one realised I was delineating something that ordinary people did and would be revered for in 100 years time. Until I pointed-out the motivation. They thought I was getting cheap laughs. As if!

It is very difficult to see this when it is just what people do, now. I refer you to the "Seeds of Love" incedent in Sub Hamden as witnessed by C#. And look what the insight did for him!