[What an odd question. A human, then? Quite a few of the people here seemed to be, after all.]

Oh, there are all sorts of ways to tell you've gone somewhere you shouldn't. A sudden chill, an unexpected change in weather... or maybe uneasiness or the sense you're becoming lost.

When a lake's covered in mist no matter what, you're bound to hear stories of something hiding in its depths, right? Even I might have made my presence too obvious when I was keeping an eye on my hospitals. So maybe it's similar?

Of course, I'm still only learning about Pokemon! I'd like to think it could surprise us with possibilities no one's considered yet, too.