The Messenger of the LORD appeared to him there as flames of fire coming out of a bush. Moses looked, and although the bush was on fire, it was not burning .
Exodus 3:2

Well I wish he would do that where there is a large group of people or something these days where it would be recorded or at least maybe broadcast live and could be debunked or approved as true/whatever/however you say it and he could do a q&a for all of us. I mean he has many options to come to us in form or write a letter or visit us/etc.