Twilight has just put a crack in the library's front door.
Twilight has damaged government property.
Twilight has been in Ponyville for less than a moon.
Twilight has to fix this before anypony of importance finds out and word gets back to the Princess, which means Twilight is going to be doing all the work herself in the name of desperate secrecy.
Twilight is screwed.
(Part of the Triptych Continuum, which has its own TVTropes page and FIMFiction group: new members and trope edits are welcome. )
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