To be fair to diarrhea, as an adult I've never experienced it as a loss of fecal continence like that "bigger guy" described: if I stay home sick and go to the bathroom promptly when I feel the need, I don't get shit on my boxers or bedsheets. I don't mean to shame legitimate human beings who experience fecal incontinence with advanced age or serious disease, but it's beyond any diarrhea I've experienced as an adult in my thirties.