Before this covid junk I used to use coughing as a special treat for people who cut in line in front of me. Usually whoever I was with would want to demand a proper fight. I on the other hand would start coughing, manically. "oh God I can not shake this flu, did I tell you I was up all last night it was coming out both ends?". Usually they did not want to be 'in front' so much any more. If they got belligerent just stick out my hand 'oh sooooooo sorry I did not mean anything shake on it?'