"We knew that he was bored as the aquarium is closed for winter, and at two feet, seven inches Otto had discovered he was big enough to swing onto the edge of his tank and shoot out the 2000 Watt spot light above him with a carefully directed jet of water."
Director Elfriede Kummer who witnessed the act said: "We've put the light a bit higher now so he shouldn't be able to reach it. But Otto is constantly craving for attention and always comes up with new stunts so we have realised we will have to keep more careful eye on him - and also perhaps give him a few more toys to play with.
Link -Thanks, Johnny Cat!
http://www.neatorama.com/2008/07/08/octopuses-play-with-rubiks-cubes/
or this:
http://www.neatorama.com/2008/01/11/octopus-loves-his-mr-potato-head/