Poop. Pee. Pants.
Sometimes they go out or down when they shouldn't, causing cautastrophe and humiliation.
A Reddit thread asked people to confess the most embarrassing moment of their life, and it is easy to understand why these incidents were so traumatizing.
1. From sdautist:
My pants fell down in the City Hall parking lot while I was dashing for the Starbucks next door. I didn't notice at first and kept running until I felt something around my ankles. Mortified, I spent the thirty minutes before work cowering in the bathroom. Since I worked front desk in HR (and was new), I saw many city officials on a daily basis, many of whom visited that same Starbucks every morning. I flashed the mayor.