Happened to me a few years ago...
Well you may have guessed I enjoy weight training. So in the gym with my training partner and it was leg day.
Racked up the bar ready for a bit of squatting. First couple of sets warming up, third set increased the weight I was pushing them out and as sometimes happens farted..normal ok. Training partner replied with a few choice words as he was supporting me, i.e. Hands under my armpits and squatting with me for support.
Ok my fourth set extra weight, tighten belt get in position, buddy behind first couple ok then had to work hard, next thing farted but didn't stop there complete follow through, mate heard then felt it hit his leg screamed jumped back me now with no support bodily functions lost, couldn't hold the weight pushed barbell off backwards and fell flat on my back into all load of s***.
Guys in the gym looking on in horror then falling over laughing so much. Took an age to live down, still kept same training partner but squatting moved to Smith Machine just in case :0)) xx