A long time ago I had a simple idea for a tech demo of a game, attempting to replicate a sense of touch by using short, transparent icons to indicate things happening out of vision range.
I think this was after CoD:MW was released, I don't know if I'd played it at that point, but pretty sure I had played CoD1, and probably other things with hit direction indicators, so it wasn't entirely original, but it was definitely expanding upon that to a level that didn't exist at the time - and as far as I know, still doesn't.
The first "scene" I had in mind for it was you as a kid in a warzone, you pick up a gun and try to fire it, but the recoil knocks you over, and you can feel the gun leave your hand as you're blown back, so you'd get an indication of that.

Not too long after that, a couple of months or so, I was at PyCon and went to the dinner afterward (for free, because I was volunteering), and was telling someone about it there, and they thought what I wanted was "no UI", and that meant no icons either, because they're UI, so they were saying "you could have the camera force look to your empty hands [after the initial shock] to show it".
I don't know how they managed to misunderstand it so completely, but I do clearly remember that at that moment I thought "there's no point talking to this person; he has no imagination".