"...movie"

As for the space alien invasion post below. Like them smart guys on PBS say. We might not recognize them alien folks as alive much less sentient. Very likely they'd see us,...or not see the same way.

Them folks could even be here right now in some form. That, and not visible to us at all.  Heck we not noticed by them either. We're broadcast they're cable.

This would make for a very short Monster Movie.