Is this a riff on Count With Chicken Lady?
I couldn’t remember any ‘knock knock’ jokes aside from ‘interrupting cow’ and everyone knows it at this point, so I looked up a bunch of them and the only one I chuckled at, went as follows:
Knock knock
Who’s there?
A little old lady who
A little old lady who who?
I didn’t know you could yodel.













Ok, go edit the wikipedia article then if you’re so sure of yourself.