This one is not so exciting to look at, but it totally wins the bizarre animal contest. It is colloquially known as a “sea squirt.” This is a sea critter that eats its own brain. A marine invertebrate, it spends part of its life in a larval stage where it can swim around in the water much like a fish or any other mobile animal. This is a relatively brief period in the sea squirt’s life. They cannot feed in this stage, so they swim off, find a nice little bit of seabed to settle in on, and then plant themselves.
A modern horror movie so good, it inspired an entire universe of future films including two more Conjurings, the Annabelle series, and this year’s The Nun. The original is still the best, though. The Conjuring is inspired by a real-life pair of paranormal investigators, Ed and Lorraine Warren (played by Patrick Wilson and Vera Farmiga) who come to help a family whose farmhouse may be haunted.
A headless goddamned ghost appears right in goddamned front of them. You literally see it materialize on camera -- of all the entries on this list, this is the one you absolutely have to watch (here's a shorter version that cuts right to the ghost if you don't have 4 free minutes). Seriously, your mind will be blown like Eric Stoltz's penis in The Rules of Attraction. As they swing the camera lazily through the room, the ghost just walks very purposefully toward them like it's delivering a pizza, while a long, low moan emanates from its phantom lungs.