leeneia, you're probably right. I've been lucky all my life to be in tranquil surroundings, and my hearing is indeed very good.
Teachers do develop a 'second sense' to spot any trouble before the class gets out of hand.
Speaking of vicars with ...er...wind. Once during the Consecration of the Host, our vicar genuflected and let out the loudest fart I'd ever heard. It reverberated round the church, and all the pews started vibrating as people shook with suppressed laughter. That was something impossible not to notice!