This footage of a dying frilled shark (Chlamydoselachus anguineus) was uploaded today all over the Internets. It’s a deep sea critter, so sightings are rare. It’s also called an eel shark, and thusly reminds me of a shrieking eel from The Princess Bride, and those immortal lines of Vizzini:

Do you know what that sound is, highness? Those are the shrieking eels! If you don't believe me, just wait. They always grow louder when they're about to feed on human flesh! If you swim back now I promise no harm will come to you...I doubt you'll get such an offer from the eels.