I used to wonder about this a lot. Am I real? Do I exist? In the ever-expanding universe, do I truly lie at some infinitesimally small spec beside other such points? Does the universe exist either? Are there parallel universes? Is this reality just an illusion? Am I crazy to believe that I am looking at a computer right now? What if I actually exist somewhere entirely real, but am too deluded to acknowledge it? What if we all have these delusions? What if I only know about a small part of the world, and everybody's keeping the other part a secret? (And if they are, is there a door out of the dome that I need a boat to get to?) What if I'm just a biological project that went horribly right? Or maybe I'm actually a cyborg? Alien? Extra-dimensional being? Re-born soul?
Then I decided that whichever way I thought, muffins still tasted the same. Oh well, the greatest questions are given the simplest answers.