I wish I could explain how very annoying it is that when I am down to 50% lung capacity, coughing my guts up and can barely utter a sentence, having each family member say "What??" every time I try to say something, rather than bothering to listen carefully, or letting what I have said sink in, is making me very unhappy.
And clearing my throat is not a grumpy noise but a necessity if I am to carry on breathing.
Usually the "What??" comes out as a reflex response and the listener then realises that they have understood me perfectly well the first time.