People With Good Memory For Movies....?

Ok, so last night was one of those nights where you randomly click a channel and a movie is on. I didn't know the name of it at all I just know I had seen one part of it a long time back. The part I had seen is there's 3 men in a house. Outside, it's snowy. I'm guessing the setting was in Alaska, not sure. There's a fat man and he keeps burping and farting so they let him lay down and the 2 other men get distracted by lots of animals moving. When they get back to the hall, they see a bloody trail leading to the restroom. When they open the restroom, they don't know whether the man is dead or alive but they do hear him "drop" something as he sits on the toilet. At that point he topples over, bloody from behind, and there's a slithering alien in the toilet. That's the scene with the most detail. If you have any clue please let me know.