Why don't they fall through the floor?
Okay, now this may seem like a weird title for a post, but you'll understand in a minute (maybe... I mean, does any sane person really understand anything I write?).
At any rate, every sci-fi fan knows that one of the favorite "go-to" plot scenarios is the "out of phase" conundrum. You know, they're out of phase, so they can now walk through walls, objects, people, sometimes they're even invisible. The problem to be solved is, of course, getting back "in" phase so they can again interact with other people.
Well what I want to know, and what has bothered me for years now (to the point that when that plot line comes up, I spend a good 5 minutes arguing with the television about the impossibility of what it's about to show me), is WHY don't they fall through the floor? Why is the floor - or the ground for that matter - somehow immune to any phase shifting that takes place? Why don't they fall through the earth and out the other side? Why can they climb stairs?
These are the questions that haunt me.
