I only have in the “I think this is a fart, oh, whoops” kind of way. In high school, I had a friend who was bragging about how awesome his farts while a group of 7 guys were in a van for a school trip. All of a sudden he got real quiet and then we all noticed this horrible stench.
Needless to say, he pooped his pants while trying to amaze us with a loud fart. Now he had to figure out how he was going to play this one off. He basically could make no excuses: we had to pull over so that he could change into some new jeans, and when he got out we could all tell that he shit his pants! Ha ha! He wanted to save his soiled jeans, but we made him throw them out the window since they stunk so bad.
In the movies when people get real scared, they crap their pants then, too. Any funny pants-crapping stories?