Real rat or not, Peter goes so bonkers looking for this thing that it doesn't even make sense! Broken water pipes, holes in the walls, holes in the ceiling, wrecked furniture...he'd almost be better off just letting the rat live! Or even better yet: act like a normal human being, hire an exterminator, tell your employer you're going to be out for a few days to deal with some personal issues and problem solved. Instead, he half-ass tries to get an exterminator (and fails) then loses his mind fighting the rat himself. People at work, (rightfully?) believe that he's cracked under the pressure of the project and maybe he has. The story is so illogical that, by the end of the film, I was seriously doubting the rat even existed.
OF UNKNOWN ORIGIN is best looked at as a dark comedy. My favorite part of the movie was Peter's kid. He's such an obnoxious fuck that during a dream sequence, he's still a little shit!
Double-feature with MOUSEHUNT or maybe even HOME ALONE.
