Mathmatically proven that you can run a simulation wthin a simulation and that we could be a simulation within a simulation and that the matrix could be real...
relevant XKCD
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Morpheus: Have you ever had a dream, Neo, that you were so sure was real? What if you were unable to wake from that dream? How would you know the difference between the dream world and the real world?
Honestly... I've come close with lucid dreaming... taste, smell, touch, sound, vibration... shit most people don't normally get in dreams.