It would seem so -- but alas. Are you only dreaming? Are you under the influence of mind altering drugs? Are you insane? Have you misremembered a suggestion as an actual occurance you witnessed. All these are possible explanations for your "observation" that change it from "fact" to imagination.
You can say there is a line between "fact" and "theory" but it is going to be arbitrary. In reality, everything we believe is a theory. We self-assign more confidence to some theories than others.