Twilight Sparkle and Rainbow Dash are falling. To their deaths, probably. It wouldn’t be much of a problem, but unfortunately for Twilight, Rainbow Dash enjoys herself way more than the situation should allow.
While exploring Canterlot Castle, Pinkie and Rainbow Dash uncover a room filled with stone tablets connected to dials. Above each dial is the name of an alicorn. These couldn't possibly control an alicorn's power, could they?
All Rarity wanted to do was take a shower. A new kind of shower, using something nopony had ever owned before. So really, how could everything else possibly be her fault?
In which Rarity learns that her ideal mane-and-tail shampoo has gone out of production forever and so experiences a perfectly reasonable (and logical!) series of reactions.