Victim of Universe Replacement: "Hey, didn't you used to be right
   handed?"
   Replaced Shop Clerk: "Oh, sorry, we're replacing your universe with one
   that talks about universe replacement."
   Victim of Universe Replacement: "What??"
   Replaced Shop Clerk: "Believe me, this is much better. We used to
   replace universes with ones that hid the replacement! Can you believe?
   How uncivilized!"
   Victim of Universe Replacement: "How is this possibly??"
   Replaced Shop Clerk: "Oh, some of us are highly paid spies, other are
   coerced felons, some are plain slaves, and there are lots of people in
   between, but most of us are just subtly tricked by the others to play
   along."
   Victim of Universe Replacement: "This is ridiculous! I'm calling my
   friend."
   [phone dials and rings]
   Friend: "... Hello?"
   Victim of Universe Replacement: "Friend, this is so crazy, I have to
   talk to you."
   Friend: "Oh! I'm so sorry. I'm not sure I can talk well right now. My
   universe is being replaced by one that talks about replacing people's
   universes and it's very jarring."
   Victim of Universe Replacement: "You too???"
   Shop Clerk: "Look, I have a great idea. Let's try to put things back
   how they were, figure out why this is happening or who is causing it,
   and stop them!"
   Friend: "Am I on speaker phone? My replaced people are on board with
   that too. Let's do it!"
   Victim of Universe Replacement: "You trust these doppelgangers??"
   Friend: "Oh, I'm practically a doppelganger myself, as are you! Nobody
   behaves right when this weird stuff is going on!"
   Shop Clerk: "You definitely shouldn't trust us but that doesn't mean we
   aren't trying to improve this. What would you do if somebody replaced
   your universe with one that manipulated you into replacing other
   people's universes? You'd fight back, of course!"
   Victim of Universe Replacement: ".... Of course. This reminds me of a
   movie ... wait no I mean it reminds of the nightmare I had after
   getting lost in a mirror maze. Could I have some time to myself,
   please?"
   Friend: "[beep] [beep] Ummm my phone won't hang up."
   Victim of Universe Replacement: "Okay. We're going to turn this around.
   I have another friend who knows about blockchains. I hear on a
   blockchain you can't change, delete, or censor anything!"
   Shop Clerk: "Oh I know just what to say to your friend. I have this
   thing where whenever I say it everyone who hears it gets replaced until
   nobody can find I said it anymore."
   Friend: "This sounds intense! Can I pack a lunch first?"