Like in the car, everyone always has a headrest, no worries.
Rubbing the nostrils or merely trying hard to not breath?
Thinking twice (or about peace) before uttering any word.
Teachers used to say, whenever you wanna drink, turn your head 180 degrees.
And the clapping etiquette always happens just because the MC says give a round of applaud, but it will always be quadruplet-fold or even more.