I was thinking, one day a while ago, does everyone see every object the same, or does each person see everything completely differently and their brains just edit the image so that it works with our brains? Then, I went on and thought "how would we know that we're not just being secretly controlled?" Then I read "1984". So, after that, I questioned mathematics and the possibility of infinity, and why, when every other number can be perfectly organized and displayed, why can't there be a rational number at the very end of it all? Finally, I just thought about the contradictions of religion and the quandary that religion has placed itself in by trying to show that religion is completely correct.
it's mindblowing if you think about it hard enough.