In my high school's production of The Little Mermaid, Sebastian is supposed to take off Chef Louis' pants during Les Poissons. Well, instead of just taking off his pants, our Sebastian took off his underwear as well (on opening night, I might add). Luckily, he had on a long shirt so he was covered in the front but the orchestra got a nice view of his behind.
It was absolutely mortifying and we still joke about how "Flotsam and Jetsam" got their time in the spotlight.