Something, something, probably-already-used-intro, The Spy of the Tiger!

"Spiiiike!" Twilight yelled from the top of the stairs. "Would you bring me that stack of books, please?"

The floor tremored for a moment before a spike of crystal jut out of the floor, hurtling the books at the mare. Twilight picked up one of the books, staring at the hole torn straight through the center.

"Well, guess I gotta expect that to happen."