A few years back while doing the selkirk merida, my mate says he needs a shit so goes off into the bushes just before the last big climb, so we leave him to it and proceed up the climb, while eating our grub at the top, he comes up over the hill all red faced and tells us he just farted for five minutes, still makes me laugh today and i though my stomach muscles were going to cramp up with laughter at the time.