A powercut so all the lights went out. Plus it was in January so we couldn't see a thing.
At GCSE I was taking an exam on my birthday so had this huge pink birthday girl badge on, someone decided to not check the candidate numbers and sat in my chair, so I thought I didn't have one. We didn't discover that this guy was in the wrong place until I had walked up and down the sports hall several times looking for my seat, in front of my whole year
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Someone's phone went off four times in our French exam this year and he didn't even get a talking to.