<human>: Track back to eighth grade. Mobile phones were fast becoming a common possession amongst the youth and I was the first in my class with a fancy colour-screened one, with an even fancier camera and - most importantly - a quality loudspeaker & voice recorder.

Such hallmarks are to be merely expected these days but alas, the year was 2004 and the Nokia 3315 - a mighty phone, though a phone less many of these features - still reigned supreme. Mine was a standout (now some know-nothing phone called "Siemans") and its loudspeaker vociferous.
One day in class I sat and recorded a friend screwing around. I think it was Japanese; we screwed around a lot in eighth grade Japanese. All of a sudden the bell went. We went to recess.

Lunch came about, I was demonstrating my phone's functions, showing off it's fancy contrivances. I exhibited some photos, played some recordings. The bell was faintly heard. We began to pack up.
But no one else moved. We quickly realised that the bell was only localised to our immediate surroundings. The surroundings of my phone. 
Someone joked with fantasy of a situation that got us out of Japanese where the sounds of the bell played from my phone and the teacher mistakenly dismissed the class.

Took nearly four months for them to figure it out. Those old PA's sure can play up every now and then. 
Play it smart, kids.

Condense the text into a few key points
<bot>: Record your high school period bell that's played over the PA and get out of class early if you're 2 kool 4 skool.