I was in 5th grade, taking a math test... just after lunch I believe, LOL
The room was quiet, the pressure was building. I was fidgeting in my seat trying to restrain myself. I did not want to ask to go to the bathroom in the middle of a test.
Then it happened... reverberating off of the hard school desk chairs.
EVERYONE BUSTED OUT LAUGHING! I don't know if everyone or anyone knew who did it, but I did, LOL