All the sneezes in movies are fake.
Have you noticed that? It's because if the actor actually sneezes while shooting, and that it's not in the script, they would cut and retake. Why?
We humans sneeze on a regular basis. Why must all characters on the screen never sneeze out of just... being normal human beings?
Ah, I can hear it already. Random events like a sneeze would be a distraction for the audience. Why? You hear people sneeze, the most you would do is say bless you. Less than 5 seconds later you'd probably completely forgotten about that whole event. Why is it that when a character sneezes on screen, everyone will infer some cause and effect that sneeze would have with the central plot? When in real life, you never do that. You'd never ponder if that person who just sneezed is about to die of a horrible disease, or signal the coming of a disaster. It's just a fucking sneeze.
There is no random event in a movie. Everything *has to* have a reason to exist. Every event, even a sneeze, must have a cause and effect, relevant to the plot. Real life is not like that. Some stuff just happens for no reason and have no consequences whatsoever.
Why do we *expect* such "cleanliness" with regards to the plot? It's because we've been *trained* to see everything in movies having a reason to exist. We are taught that Chekov's gun that *must* be used. We are conditioned to expect a squeaky clean, ultra high SNR with the movie's plot and message. Any randomness and happenstance is a blemish that must be removed. And we still call it "realistic".
I think we should as audience tolerate some level of "noise" in the plot. Some things in life just happen with no particular relevance to the plot. Just let it be. Don't think too hard on a sneeze.