This thing have buggered me for some time. I'm not sure if everyone is aware, but if you persist walking into the mist - away from maniac's mansion - after *many* passes, a mysterious (human?) silhouette appears in the mist, running into opposite direction - accompanied by a "break" in the music. Scarring the sh*t out of you (when you just assumed, that walking into the mist can go forever without being disturbed) is a bonus side-effect ;)

Now, does anyone have a slightest clue what it is? It is just some passerby, that we notice further in the mist, and are unable to interact with, due to circumstances? Or is it some kind of "creepy" bug, like with maniac's wife appearing in Garden, during Cry's play-through, and Remigiusz never planned to add it into the mist?

cheers,
/Estel

I guess it's just a shadow \ hallucination, like the one in 'River'. It's there on purpose for sure, as you can get Steam achivement for encountering it :)
As for Cry's playthrough, I have a theory what happened there but I'll have to verify it :)

Well, have you verified your theory? If so, please share.

It was pre-patch, so no :)
But my theory is that trying to call home number using landline, while producing no visible result, triggers Gladys to go to the library...