You could argue that a 20kg barrel jellyfish is entertaining in itself. But it’s Mango the dog doggy paddling in the background that truly makes this video clip. It’s unexpected, which is why it’s so brilliant. And it’s this element that makes people want to share the clip.
Mango’s cameo also provides a useful sense of scale, allowing us to fully appreciate the huge size of the tentacled creature pulsing in the foreground.