This was one where a guy travelled to the year 2042 to meet his future self or his future self travelled backwards in time to 2006. Maybe they met in-between somewhere, since he went from being in his kitchen to being in a field with his future-self? Notice the resemblance? The proof is the photos he took and their matching tattoos.
I talked with someone who is very scientifically inclined, and she said that time travel, if possible, could only be feasibly done by going from the present forward into the future. It would not be possible to go backward in time. However, going forward in time would cause a branch timeline. That actually makes a lot of sense to me.
Oh, gosh. The multiversal time travel theory. It's trippy. just adds another branch timeline of one's own universe. It changes everything, just like the Flash stepping on the wrong leaf of grass. It makes variants of us and everything else for a new dimension. Plus, it'd be easier to move forward than backward in time, if it happened.
Because moving forward is the easiest way to create a branch timeline. This has nothing to do with the Flash. You would create a branch timeline in doing so.