If you rearrange a deck of cards enough times, then statistically it will eventually be in its original formation. Due to the fact that time is infinite, the same goes for the particles in your brain. There is a higher chance of your brain briefly forming in a void complete with memories of living than there is of you actually existing on earth. The only thing you can be sure of is the existence of your own mind. If you are reading this, you are likely the only real consciousness to have ever existed in the entire universe. You are alone. Nothing is real. This theory is called the Boltzmann Brain.