just a thought
reading about (mostly) deep sea creatures makes me believe that many bad-but-fun media monsters could actually exist [assuming there were proper evolution conditions]
i mean, check those out:
fangtooth/tiger moray
sea pigs
gulper/pelican eels
deepstaria jelly
siphonophores
stomiidae fish
basket stars
telescope fish
climbing cave fish
grideye fish
lotta extinct species were funky too - gondwanasuchus, basilosaurus cetoides, some types of ammonites, gastric-brooding frogs (not in terms of looks, but in terms of breeding, wacky)