Not a "malfunction" so much as a "wardrobe incident". I live in NYC and ride the crowded subway frequently. The weather becomes very hot and maneuvering the subway system becomes a bit cut throat, or cut pants i should say. I didnt realize that the back of my pants got sliced open when they got caught on something and unknowingly exited the subway with a buttcheek completely exposed. I didn't know it for blocks, until a doorman pointed it out to me. I died that day.