A group of fisherman off the coast of Florida shot this moderately horrifying video of a prehistoric-looking fish taking down a small shark in a single bite.

The Nightmare of the Sea—an appropriately named Goliath grouper fish—can apparently grow up to 800 pounds and live as long as 50 years. According to ABC, grouper fish normally don't eat sharks, but do apparently enjoy silently stalking divers from time to time, so just think about that the next time you go in the ocean.

[h/t Uproxx]