During my gcse ethics exam, the deputy head tripped over and hit his head on a desk, and then he got up and walked out of the hall
During my maths exam, someones phone went off and their ringtone was "this is why i'm hot" hahah it was this weedy boy who then got sent out.
Once, during an exam they had to open the doors because it was very hot, sometime later a cat came in and began to meow very loudly, the invigulators never caught it and what a sight it was.
There have been quite a few comical moments and I hope there's more to come