Welcome, subject, to the most advanced brainwashing program in the galaxy!
Convince the subject that reality is not, in fact, real.
Feed the subject new, contradictory information, until they doubt their own perceptions.
Reiterate the new truths until the subject's mind is muddled beyond recognition.
And so, the subject is brainwashed.
Proceed to Indoctrination for the next phase of our program.