As a scuba diver, I have seen California sea lions killing ocean sunfish (mola molas) for what appears to be pure sport. The sea lions tear the fish's fins off and play with the body like a living frisbee. Then when they get bored they let the maimed fish sink to the bottom to be eaten alive by crabs. Occasionally you'll see like a dozen of those half-dead molas clustered together on the seafloor, pathetically flopping around as the crabs close in.
Nature, red in tooth and claw.