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You think you're real, and because of that, you're the only one who's definitely not fake. Everything else could be a lie, but you're the king of your own brain. You're like the only sane person in a crazy house.
I think I'm real, so I must be. The rest of you are just figments of my imagination.
Bro, I'm the only one who matters. You're all just dreams I had after a bad lunch.
If I'm thinking, I'm real. You're just ghosts haunting my thoughts.