During a performance of Riverdance, when this guy jumped up and kicked his legs out, I saw a white undies under the blue tight pants.
In a high school performance of Gypsy, during the strip-tease part in the backstage facing the back, I was clearly able to see a rip in this girl's skirt and I saw something hairy. And I think few people in the audience gasped.
This guy in Hairspray tour groped a girl's crotch off-stage. She was smiling. :)
A girl screamed during the gunshot in Miss Saigon at the end, and it seemed like the girl who played Kim freaked out and flinched, when she's supposed to be dying.
"Hey, you! You're the worst thing to happen to musical theatre since Andrew Lloyd Webber!"
-Family Guy