This happened to me a few years back (Senior year in high school)
One of my friends who I have known my whole life was throwing a big Halloween Party at her house. Her parents had left town on a vacation of some kind, and I figured I might as well get a bit naughty. I dressed as Catwoman in this black latex, skin tight costume. The costume had a lot of skin showing and so I couldn't have worn pants or a bra. About halfway through the evening I finished dancing and sat down on a chair in the living room. A few minutes later I got up to rejoin the dance floor, and the bottom part of my costume caught onto a portruting edge of the chair. The entire lower part of my costume came off and my best bit was completely exposed. I could have died, everyone was staring at my naked private part. I ran out of the room and into my car and peeled away.
But my night wasn't over yet...
About halfway home, my car begins to sputter and I realize that I have very little gas. By pure luck there was a gas station not very far up the road from where I was. I had to fill up my car with gas in my torn costume, one hand trying to cover myself and the other to hold the pump. I went inside and paid the man for my gas, I guess I made his night a little more interesting.