I do not, but I have 2 very slightly related stories.
The first didn't really involve me at all. I was in a hospital getting a bunch of tests done, and it took the better part of the day. At one point I went to use the bathroom, and as I was throwing away a paper towel, I noticed something odd in the trash can. Curious, I pushed some of the towels on top of it away, and realized it was a pair of kids underwear (about the size to fit a 10 year old or so) that had been ass-blasted halfway to the next dimension. I mean the back was just covered in shit. I couldn't decide if I was mildly turned on or if I just felt really sorry for the poor kid who this happened to, while away from home no less.
The other story does involve me, but still isnt what you are looking for. I was in highschool, and had been wearing a diaper for most of the day (it was a weekend) I was wearing sweatpants, and my diaper had just slightly leaked, to the point where you couldn't see it, but I was pretty sure I could smell it. That could have been from the fact that I was wearing a soaked diaper though. Anyway, I go and change back into a pair of underwear, but dont change my pants since the leak wasn't visible and I wouldn't have a good explanation as to why I just randomly changed my pants. About a half hour later, I managed to inflict a significant injury on myself. After passing out briefly, nearly smacking my head on a counter top in the process, I ended up going to the ER. While there, I remember worrying that the doctor who saw me would be able to smell the faint left over odor from my diaper. As far as I can tell, they couldn't, but still.
Like I said, not what your looking for, but figured why not?