You trip.*

You decide you definitely need to leave. Now. You don't care where you go, as long as it isn't as public as here, given your complete lack of any undergarments. Though, as you start to leave, it only takes a few moments for something worse to happen.

Your foot catches on the root of a tree, and in front of the various park-goers, you fall flat on your face. You feel the cold breeze drift across your completely exposed rear, and you panic and struggle to stand back up as you pull down your skirt desperately. Various eyes stare in awe at your condition. Luckily, you think only a few people noticed, but it's enough to turn your face crimson red. You stand up once more, and panic as people stare.

These people are strangers, but they still saw your rear completely bare, and now they know you have no panties. What would they think? You hope they don't find out about the rest, and you start to hustle away as fast as you can to escape the humiliation.