I would be excited if this happened to me
I mean it would be proof that parallel universes exist. It could be proof of the theory that dark matter is gravity from another universe next to ours. Maybe.
The question is is that we're these parallel universes created by branching off a single universe or were each universe created induvidually? That would be the next qiestion.
After that are the universes that are completely different? Like maybe the laws of physics are different or do all universes share the same laws of physics? Are there universes where they are nothing but gas or universes that are nothing but black holes?
As a theoretical physics enthusiasts this movie really falls into my ballpark of thinking.
Sorry if I talk weird. I tend to think in the abstract and normal words get muddied up in the translation. I find communication via words to be extremely limited. A mind to mind form of communication would be much more efficient.