Bob is a garage physicist. By some stroke of luck (though Bob would assure you it was his sheer genius), Bob has managed to be the first person to discover that our world just recently became a simulation of itself, and he has managed to gain some rudimentary control over it. He is so excited with this discovery that he wants to share it with his friend Alice. However, Bob is also a prankster. What is the most
terrifying entertaining way Bob can prove to Alice without a shadow of a doubt that they're living in a simulated world?
Bob has exactly the amount of control you find necessary for your answer.(see other bullets)
- Bob is also very suddenly rich, so flying to a deserted island in the middle of the Pacific for a more... spectacular show is fine.
- The simulation is divided into roughly 20 meter cubic "chunks" which each run on a separate core. The chunk processors are only directly networked to the 6 directly adjacent chunks. Bob currently only knows how to modify the properties of and objects within the chunk he's in. (One idea I'd been playing with for an experiment of theirs after the reveal was modifying the chunk's current timestamp and throwing a paper airplane across one of the faces.)
- Human minds are run in protected memory; they can't be modified or even monitored programmatically. (Sensory buffers, however, are still open.)
- Over the years, Alice has grown to be naturally skeptical of Bob's "discoveries." Your proof must be impossible to explain any other way (beyond, of course, that this is all a dream or things to that effect).
(Sorry if this invalidates some previous answers.)
Answers will be judged based on how complicated the proof is for Bob to set up versus how little Alice can doubt him after the fact.