I don't expect it to be enough for you to believe. It can't. You don't know me personally so it's easy to just assume that I'm lying to you. No matter how many stories I bring to you, you will just write them off without even investigating them. You are already preconceived to dismiss my stories so you are not open to even look into their validity. And even if you did, you would still insist that there must be some other explanation because no matter how much evidence is presented, it still wouldn't be proof to you because you've already made up your mind. You will only accept a scientifically measurable data point, and frankly that's a reasonable demand. However, not everything can be measured scientifically. And if your acceptable level of evidence is bound to only what can be perceived and measured by our limited human senses, the your universe is sadly small.
You don't have to be lying. There are a myriad different ways that the hallucinatory brain state of a conversation with another can be induced: dreams, drugs, stroke, epileptic seizure, tumours, trans-cranial magnetic stimulation, genetic predisposition, sleeplessness, etc. The person telling everyone that they had an experience may well have had that experience, but it's only accessible to them and them alone. That's the problem.
As for whose universe is small, it's usually the Abrahamic religions that claim that the universe is just designed and built for humans alone. That it's all about God's plan for us. All those 100 billion galaxies with 100 billion stars are just decoration.
