There was a young girl alone at home. Knock knock knock. She went to the door but no one was there. Again, knock knock knock. She peeked through the window and saw a shadowy figure. This time when the knock came, the door slowly creaked open. She screamed as a pair of cold hands reached for her.
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.
One possible reason could be that she is angry with the person holding the food. Maybe they had an argument before and she wants to show her displeasure in a rather aggressive way.
Well, without more context, it's hard to say exactly who she is. She could be a rival of the person. For instance, in a workplace cafeteria, if there is a promotion at stake and the food somehow represents success or a reward, she might be a coworker who wants to undermine the other person.
Sure. Knock knock. A traveler was at an old inn. Scratch scratch. He heard strange noises outside his room. He opened the door, but no one was there. As he went back to bed, he felt something crawl under his covers. It was a small, bony hand. He realized the inn was built on an old graveyard, and the spirits were not happy about his presence.
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.