I had one last year. We were riding in the Ouachita Mountains in SE Oklahoma. I was in the lead going down a very steep narrow trail. We came up to a huge drop off/wash of about 4-5" (Note that's feet not inches) straight down. There was no way we could turn around, we had to go down. Remember we were going down hill anyway on a steep grade. My husband was behind me and later he told me all he heard was me saying "oh sh** Vida" and then I disappeared. I guess she knew we had no choice but to go for it.
We found out later that particular trail was closed because of that drop. I was kinda proud of us but mostly scared to death.