It's happened to me twice actually. Once was a college night gone overboard, really drunk and mountains of fast food = puke and diarrhea at the same time. Another time 10 years later was 2 weeks post giving birth to twins and I was so constipated and had only pooped once since they were born so I was drinking tons of tea and water and took too many laxatives and one big sneeze did me in and I totally shit my pants. I did not care what so ever though because I was no longer constipated and uncomfortable!