In Hilbert space, the wave functions will eventually express all possible formations. On the list of possibilities is the notion that a 'brain' or similarly self reflecting, conscious network, might suddenly emerge out of the particles and probabilities that were otherwise minding their own business. This, or what this description wishes it was accurately portraying, is known as a Boltzman brain. More intimately, it reflects the possibility that a brain might come into being in such a configuration that it has 'memory' of an entire life that didn't exist before the instance of its emergence.

There is a non-zero chance that anyone is in a universe whose data is examined by other universes without that universe having any data indicating this to be the case. This is known as the Boltzmann peeper hypothesis and refers to the idea that there are classes of multiverses watching others. Even when the watched universes are doing what they would wish to keep discreet such as pooping or genocide or watching children's cartoons that make one sob like an enormous ugly baby; even during these times, nothing prevents the watching universes from looking on.