Want to give an arachnophobic diver a heart attack? Put a Japanese spider crab in his path. These critters have very, very long legs which can extend up to 12 feet. Despite their somewhat intimidating appearance, they are reported to be quite docile and friendly, and a lot less scary than many of the more innocuous looking species that inhabit the ocean floor.
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.
First up on the list is the aptly named Blobfish. The best way I can describe this thing is by asking you to remember those old Wild West movies. Remember how everyone was always spitting their chewing tobacco into those metal bins? Well, imagine you looked into the bin after a couple of hours. What you’re looking at is basically a massive slimy blob of phlegm and snot. Throw in a two googly-eyes and use some lipstick to draw a mouth like the Joker’s. That is essentially your Blobfish.
The daintily named sea pig is actually a kind of locally abundant sea cucumber that inhabits the world’s abyssal plains up to 3.7 miles beneath the surface. It gets its name from a characteristic pink, eggplant-shaped body and bloated legs that give it a porcine appearance. Like their shallower cucumber cousins, sea pigs play an important role in marine ecosystems. They feed on detritus that falls to the seafloor from the rich waters above, whether plankton or a whale carcass. They walk along on a few large tube feet, using a combination of muscle contractions and body fluids. Modified pairs of legs can act as antennae to detect food. 
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