The guy in front of me farted once in an exam, and i almost burst out laughing...
it distracted me for five minutes because i spent the time trying to hold my breath rather than answer the questions.
thankfully, he hasn't farted anymore.
what i hate the most is how everyone around me is sniffing their noses A LOT. the invigilators have told them to bring sweaters and tissues a million times, but they never do! so they just keep sniffing and sneezing, and shivering (because the ac is always on). it gets really annoying