Your comment took me quite a while to parse, but it's actually incredible. I had never considered that somewhere deep down I have a sensation of "being" inside my body, which I guess some part of the brain is responsible for. Our senses can be fooled as we all know - if this sense became confused, it seems plausible that one could experience the sensation of "being" - in the sense of, their phyisical geometric location in space - somewhere else, other than between their ears.
If this could happen then the experience could possibly manifest itself in a few ways. In the larger discussion thread, many are talking about having an experience where somebody feels they are at one with the universe, so their sense of being is that they feel like they are everywhere.
Another possibility that occured to me is, consider that we percieve the world from the position of inside our head - which also happens to be the default calibration for our sense of geometrical "being". We also experience vision from this perspective, so it seems completely normal to assume that our brains process raw eye-signals. However, consider the possibility that our experience which we call vision is actually not the raw data feed, but actually is calculated/derived from both the raw data feed and our internal sense of geometrical viewpoint. If this were the case, then someone who had their sense of geometrical viewpoint displaced (but was still taking in raw data from their eyes, which do have a fixed real-world location) would experience a sense of vision, from the viewpoint inside the world wherever their sense of geometrical viewpoint has been displaced to.
This seems a plausible explanation for how people (who are often experiencing medical trauma) could have a legitimate out of body experience - their sense of geometrical location was displaced, but their brain continued to process vision, so it projected a viewpoint from location X using the data it was receiving from positiom Y and what it already knew of the world.