Some people believe that belief itself can (and does!) actually create reality. But that is only a belief. Of course, if you believe it, then it is true for you, because you made it so. If you don't believe it, then of course it is not true, but perhaps that is only because your belief made it not so. Or is it true, whether you believe it or not, or is it not true, whether you believe it or not? And if you believe the latter to be the case, then is that untruth true only because your belief made it so?
There is more, but it is already confusing, isn't it?
Isn't reality fun?!

scratch2:.... but are we really talking about reality here, if all of this just existed only in my head? Oh, wait a sec... did this become reality because it was in my head? Or did...