This was a great movie.
John Carpenter isn't putting out as many movies as he used to, but when he was in his most active years, he turned out some of modern horror's most defining titles. Prince of Darkness is still a real favorite of mine, and his episode of Masters of Horror ("Cigarette Burns") was my favorite installment of that series.
I included this as the kick-off of my Creepy Creatures block of movies, and it definitely fits that category, but what made this movie truly great for me was not the monster, but the human interactions. The story centers around a group of men stationed at a remote, isolated Antarctic research station. Their communications with the outside world have been interrupted for several weeks. A helicopter from the neighboring Norwegian station comes roaring into their space, piloted by a lone man who is trying to kill a fleeing dog. It turns out that the dog is host to a creature that can absorb, and then take the form of, any living thing. As the Thing spreads through the station, the mistrust and paranoia among the crew builds and builds, and this is what made the movie truly interesting for me.
That and the fact that Wilford Brimley is in the cast, and he's not selling oatmeal or diabeetus supplies. (Yes, I misspelled that on purpose, because that's how he says it.)
My favorite scene is the one that is probably also the movie's most famous one, when the men are testing the blood samples to see which one is contaminated. Even though I knew how this scene played out, and I knew what was coming, it still got me! It's a great scene!
I give The Thing five flamethrowers out of five.