Why "Noor" Is The Whole Joke
The off-word is the point, not the mistake.
The gap is the joke: a normal "open the door" clip is not a meme, because it is exactly what you expected. The "noor" is the wrong word in a serious situation, and that wrong word is the only thing worth watching. The humor is not that he is angry - it is that the word he needs most is the one he cannot quite say. The situation is a doorway, the sound is an off-note, and the two do not match.
Why it is reusable: because the shape is general, the sound moves onto anything that is "about to barge in." The delivery person who is late, the guest who is not invited, the thing you were not ready for. Each one keeps the calm voice and the off-word, and the joke lands because the new situation is also slightly not what you expected. The word is not "noor" - it is "the word that should have been the right one."
How the game scores it: the Noor index is a measure of how absurd the reaction is. When the visitor is a delivery person, "open it" is the sane move and the Noor score is low. When the visitor is the thing that is definitely not a person, the same "open it" is the Noor move and the score jumps. The index is not about being right - it is about how far into the wrong-word zone your reaction landed.