I'm a teacher who gives conferences in front of large crowds...apparently what I have to say causes people to keep very quite (or maybe they just all fall asleep!) but suddenly there is a noise like a squeeky door or an escaping fart (I can't fart...k pouch) and you just know that everyone heard it!
That is when I make the chalk squeek on the blackboard or hit the music on the computer...or start a thundering round of applause!
Then again, I have heard students 'let'er rip' from the back of the auditorium...everyone giggles but no one dies from it....
It is just part of life