I was on a backpacking trip on Norway a couple of years ago. On the third day I had reached a pretty steep section of the trail with a rock wall on one side, and a vertical cliff side on the other.
That's when I felt it. You know, one of those shits where you know you have 30 seconds to a minute max to get to a toilet.
I instantly knew I was going to shit my pants and made peace with it.