Dolphins harass pufferfish and pass them around like a balloon... but the reason why is not what you might expect.

This is the astonishing moment an inflatable Nemo fish seemingly came to life - opening a door by itself and escaping. CCTV footage shows the helium-filled clownfish balloon hovering in the air inside ...

These types of balloons can cause power outages when released outdoors because their metallic coating conducts electricity, which in turn poses a risk to the electrical system.