So, I just heard a helicopter passing through my neighborhood.
I didn't needed to go outside and look at it to confirm it was a heli, I could hear it and identify it.
Everyone else in my house that also didn't saw it thinks it was a 'different sort of aeroplane'.
They can't tell the difference between the soundwaves of a plane and a heli. I mean, I've never seen many helis in front of me but I think that movies and gaming gives you some sort of edge to identify certain things. It's not because you never seen it that it's not real.
This gives me a strange hope for the future...