This is a video of an Atlantic Midshipman fish attacking some sort of holographic fish from the future (actually a species of barracudina) from its burrow some 500 meters below the ocean's surface while three scientists provide some live, light-hearted commentary. It's worth a watch. And not just to remind yourself that the ocean is a terrifying place, but it is and they should really put up signs.
Keep going for the video, but make sure to stick around for the twist, extra-tragic ending.
Thanks to Crash & Smash, my new middle names.