Better Living Through Science and Ponies/YMMV


 * Fanon: To some, the whole story.
 * Flanderization: GLaDOS is uncharacteristically bloodthirsty, as opposed to merely sarcastic and passive-aggressive. But given this is the third time Chell has tried to kill her, it could be chalked up to a form of Villainous Breakdown.
 * Word of Fan Fic Writer states that was exactly what they were going for.
 * Moral Event Horizon: Acknowledged in-story. Chell has managed to leave Apeture behind her and is now living a happy, glorious life as a pony in Ponyville. When GLaDOS still manages to ruin her life and abduct all her friends, Chell decides that she's finally crossed the line.
 * There's also what she does or tries to do to the Mane Six. The things she does to Fluttershy and Pinkie Pie are especially vile.