That revolting thingie up there that Brynn posted is probably some kind of bryozoan. They're kind of like coral polyps, but sometimes they secrete a jelly matrix instead of calcium carbonate. Predictably, I have heard of them because nudibranchs eat them.
This, on the other hand, is quite obviously from outer space.
Okay, really it's an Antartic sea cucumber affectionately nicknamed a sea pig, but still.