I know this story IS funny but it's mortifying too so bear with me.
I sat my GCSEs in 1997 and in one of the exams (Maths, I think) - I had had some high fibre cereal forced down me by my mum and I was nervous and with one thing and another, I farted loudly in the middle of the silent exam hall.
I'm now 31 with a DD who turns one at the end of the month and one of my friends persists in bringing up this story! The thing is we lost touch for a while then met at baby group as her DS is the same age as DD. first time she saw me and it was "oh I know you ha ha you farted in the Maths exam!"
AIBU to ask her to stop going on about it, or a misery guts? It was funny but a long time ago ...