Otto the octopus is an octopus at the Sea Star Aquarium in Coburg, Germany. In 2008, Otto had been annoyed by a bright light in his aquarium and had managed to extinguish it by climbing onto the rim of his tank and squirting a jet of water at it. 

At first, it baffled electricians and staff because they couldn’t figure it out. They had to take shifts sleeping on the floor to find out what the cause was. The major problem was that it shorted electricity to the entire aquarium, threatening the lives of other animals. 

On night three of the rotating sleeping shifts, Otto was discovered to be the culprit. Otto had been shorting the lights at that particular time because he was bored due to the aquarium being closed for the winter. 

To Otto’s dismay, the light was moved higher up so he couldn’t reach it. Still, Otto is constantly craving attention and always pulling stunts like this one, so something else is always bound to happen. He’s been reported juggling hermit crabs in his tank, throwing stones against the glass, and even rearranging the items in his tank every now and then. 

(Source)