This is a scene from my story "Hot Heads, Cold Hearts and Nerves of Steel"
While on a private train to the Crystal Empire, the Mane Six, Cadance, and Shining Armor have an impromptu slumber party and a game of "Truth or Dare." Rainbow Dash, after accidentally hurting Twilight's feelings, is dared to do the "Ladybug Dance" ... when her hoofise (onesie) experiences a wardrobe malfunction during the "Do a Little Shake" part.
So now her rump is hanging out in front of her friends, Cadance (her old foalsitter), and worst of all, her long-time crush, Shining Armor.
Lol, I didn't see this correctly on the front page, but hey, it still got a grin out of me!
Sometimes it must suck to move too fast, and she got those buttons loose... lol... if that happened to anyone in reality, then I would give them my full condolences xD