Inky the Octopus escaped from his enclosure in the National Aquarium of New Zealand by sneaking out via a hole in his tank, then fortuitously finding a drain pipe that leads to the ocean. (Story.)
Octopodes are famously adept at being able to escape through tiny holes – anything over the size of a quarter is fair game. They play games, use tools, and predict the results of sporting matches (okay, not so much to the last one).
The Fog of Law 