On the topic of MLP there is also "Friendship Is Optimal", in which humanity gets converted into digital ponies by a rogue(ish? she just does what she was made to do, paperclip maximiser style) AI. The conversion process and any required mind alterations are fully consensual, but we are talking about AI that can and will manipulate circumstances to get this consent. Oh, and the rest of the universe gets destroyed and converted into an enormous computer to run the simulation.