Just read this and tell me what you think.

[robvalue]

Yeah, unfalsifiable I think so it's fun but cannot be investigated.

I can be dreaming, and you lot are nothing more than parts of my dream. I could wake up in a vat, obviously, and be somewhere utterly different where none of you exist at all.

Or any number of other scenarios. We can never know which.

The best you could say, I suppose, is that we are "all hallucinating" but only to an absolutely tiny degree, where reality doesn't get significantly altered for us to notice the desynch. Anything else and it stops being a group experience and you're just off in la la land.