Well, 'Knock at the Cabin' is not based on real events. It's a work of fiction crafted to entertain and engage the audience with its unique plot and characters.
Hard to say. Sometimes stories like 'Knock Knock' blend elements of truth and imagination. Maybe it has some roots in reality, but could also be largely made up for entertainment.
A 'knock knock' full story can be a long sequence of 'knock knock' jokes strung together. Let's say we start with 'knock knock', 'who's there?', 'Lettuce', 'Lettuce who?', 'Lettuce in, it's cold out here!'. Then we can follow with another one like 'knock knock', 'who's there?', 'Canoe', 'Canoe who?', 'Canoe help me with my homework?'. These jokes are simple yet can bring a smile or a laugh, and when told in a row, they make for an entertaining 'full story' of sorts.
In fact, 'Knock Knock' is purely imaginative. It was written and developed from the creative minds of the writers and not inspired by any true incidents.
You can start by using 'knock knock' as a buildup to a surprise or a mystery. Maybe have a character hear the knocks and wonder who or what's behind the door.
The main elements are the 'knock knock' start, the response 'who's there?', and then the setup and punchline. For example, in 'knock knock', 'who's there?', 'Moo', 'Moo who?', 'Moo - ve out of the way!'. The 'knock knock' grabs attention, 'who's there?' sets up the reveal, and the two parts after that create the humor.