No, but I once shat my pants riding my motorbike on the way home in Thailand.
I knew I needed a big one, thought I could risk it a fart, maybe it was the bent over riding position, the food, or the fact that I over squeezed due to honing it down the road, either way up the back of my jeans, out over the top, up my back, on the pillion seat.
All I could do was keep on hoofing it home the remaining 50km or so.