I saw this in the video store20+ yrs. ago. I like horror films overall. I liked the title, the blurb, and i like Peter Weller's acting. He is not over the top like Shatner or Walken. This movie has really good moments: the shadow on the wall, talking to the exterminator and trying to explain to his friends what is happening to him. I like it because it tries to use old school horror techniques: imply the horror instead of showing everything outright. I think if you allow your imagination to take over you will be really scared. To the point if you hear a sound you will do one of three things: hide under the covers, check the apt./house or call 911.

You know that one guy who'd do anything to get you fired, destroy your house, alienate you from your friends and family, chew through your surge protector? You know, the usual. Well, imagine if that guy was a poodle-sized sewer rat.I wondered going into this movie why Peter Weller would agree to star in what is essentially the rat-equivalent of Jaws: The Revenge. I got my answer about twenty seconds into the film, where it opens on a shot of Shannon Tweed, playing Weller's wife here, showering. Umm, okay.She leaves, along with Weller's extremely dimwitted kid to stay at a hotel (only to pop up later in the movie scantily-clad back in her hotel or in a dream sequence in order to meet some strange 80s boob quota I suppose).Weller is doing fine by himself, (staying behind to finish some work), until the dishwasher overflows, eventually upsetting a rat who decides to move into his apartment. Its hard to gauge just how big this thing is supposed to be until it decides to crawl up under the covers in Weller's bed later, apparently he's the size of a tomcat.Weller does his best to get rid of the rat, upgrading from normal rat traps to (what are basically) miniature bear traps. When the medieval rat traps don't work or come back gnawed on he decides to get a cat, which also comes back gnawed on (or replaced with a cheap stuffed animal that resembles his cat). When he decides to ignore the rat he chews on on his surge protector, fuse box, and therein cutting off the power.Weller runs around the house, bashing holes into walls in search of the rat, is plagued by nightmares of birthday parties where the giant rat jumps out of a sheet cake (?), and where his dimwitted kid ends up mixing in various rat poisons in with his cereal. The finale brought to mind Arachnophobia as it ended in a dank basement; the film ending maybe twelve seconds after the rat's been dispatched as Weller brushes himself off as if the last two hours hadn't just happened just in time to greet his wife and kid at the front door. I'm sure they won't notice the completely demolished apartment.

Bert Hughes is home alone in his Manhattan apartment,trying to work out a major change in his trust company when a noisy rat starts scratching around his periphery and he becomes obsessed with exterminating it.By the time Hughes is through,his whole apartment is nearly exterminated-and his friends are keeping their distance due to his rat-mania.Pretty suspenseful and effective rat invasion flick with terrific central performance of Peter Weller.Several memorable moments were the diner table discussion turned to rats and everyone felt uncomfortable;and the end battle with the rat.There are also some very effective jump scenes that were finding the cat on top of the refrigerator and the toilet scene.Overall,"Of Unknown Origin" is a fine animal attack film that deserves rediscovery.8 out of 10.

It's (future) Robocop VS. Rodent in this interesting & compelling but ultimately bland hybrid between an ordinary creature feature and a portrait of psychological downfall. Textbook 80's yuppie Bart Hughes has everything you could wish for in life. Married to the previous Playmate of the year, he owns a personally renovated brownstone in the heart of New York, his parents-in-law live all the Vermont, his secretary has a not-so-hidden crush on him and he's moments away from getting that important assignment everybody at the office was craving for. Bart's perfect universe gets brutally disturbed when an unusually intelligent rat decides to join the household and run a little bit of amok in the house. When all regular rat-catching methods like traps and poison fail, Bart begins to take the battle personal. He gradually goes berserk, isolating himself from his colleagues and neighbors, with only one mission left to live for: annihilate the rat! Okay, what we have here is an ambitious script about an alarmingly escalating obsession, a stellar performance by Peter Weller and skillful photography by René Verzier who successfully manages to depict the ordinary rat like the most fierce and petrifying monster in the universe. That's very admirable and all but, in the end, "Of Unknown Origin" only just remains a film about a guy chasing vermin through the house for nearly 90 minutes. The rodent's intellectual capacities, as wells as some of Bart's desperate measures to catch it, are just a tad bit implausible and actually on the verge of hilarious, even though the whole thing is acted with straight faces and serious undertones. What type of rat are we dealing with here, in fact? Because sometimes the animal is small enough to move through the draining pipes whereas at other times it looks big enough to pass for a warthog. Or maybe its variable sizes were intentional as part of the whole psychological aspect, and then I missed the point again? I know "Of Unknown Origin" isn't meant to be a full-blooded horror film, but still the lack of blood and action was mildly disappointing. Couldn't the rat have killed the irritating neighbor, the exterminator or even Shannon Tweed? Unquestionably the most fascinating moments of the entire film are the rat trivia Bart recites to all his clearly embarrassed colleagues & superiors during a diner party. Now that scene was both creepy and educational.