Not sure if that dark shadow is leakage or just a shadow impression of my head. Anyway, I was on the way home from visiting a friend when I had to gas up and use the bathroom. I thought that I had to fart but it turned out it was mudbutt. And a messy one at that. Luckily I had purchased a new pair of underwear and went into the gas station restroom to clean up and change. Not sure if I can get the stain out of them in the wash when I get home or if they are gone.