Speculating about the existence and nature of parallel universes is a topic of ongoing scientific exploration and theoretical investigation. While the concept of parallel universes is popular in science fiction, its existence and the possibility of inter-universe travel remain purely speculative at this point.
If parallel universes do exist and there were a mechanism for travel between them, it is conceivable that individuals from different universes could encounter one another. In such a scenario, it's possible that a person from a parallel universe could claim to know you from their reality. However, since we currently lack empirical evidence or a scientific framework to support the existence of parallel universes or interdimensional travel, it remains purely speculative and hypothetical.
It's worth noting that theories like the Many-Worlds Interpretation of quantum mechanics propose the existence of parallel universes branching off from each quantum event. However, these universes, if they exist, would likely be inaccessible to direct interaction or travel due to the challenges posed by the vast distances, different physical laws, and inherent limitations imposed by our current understanding of physics.
For now, the notion of encountering someone from a parallel universe who knows you remains firmly within the realm of fiction and imagination, until further scientific advancements and evidence provide insights into the nature of parallel universes, if they indeed exist.