From NPR: The staff at a German aquarium trained 6-month old Otto the octopus to aim and squirt water at targets. It was all fun and games for awhile, but then the devious cephalopod turned his powers against his captors, squirting the lights in his enclosure and repeatedly shorting out the aquarium's electrical system. Bwahahaha, take that, foolish humans!
Haven't these people read Lovecraft?
Complete podcast here.
I love how they managed to distract him with a chess board.