Aboltsman Brains and Big Bangs

A brain could spontaneously form out in space, out of random particles popping into existence. They could assemble into something that thinks and has the exact same memories as you. And that could maybe, for like a second, think that it is you, right? Because this brain would be alive for ia little bit of time. The brain would survive for a little bit of time, long enough to think, hum, whow. Look, i'm a brain. I think i understand the universe,. or i ma to go get a banana or whatever.