What is it like to be a bat?

So Scribefire seems to be misbehaving; perhaps some incompatibility with Firefox 3 or something.  As a result, this initially appeared as a blank post.  Still, it was a short one; easy to reconstruct.  I just linked to this post from cocktail party physics, and noted that reading things like that tended to make me think I'd learned a little bit more about what it is like to be a bat.  Which, of course, also leads me to be ever more skeptical of those arguments that I can't know anything about that.