This Fish Has A Hammer, And He'll Use It 01:41
Mankind has unfortunately done quite a bit to pollute the rivers and oceans of the world. However, Smashie the Goldfish has a hammer, and he ain't afraid to use it while giving humans a taste of their own medicine. The furniture may be tiny and cute, but the video makes you think about how we unknowingly affect the homes of sea life like Smashie.
Instructables has a page that can show you how to build a similar device for your aquatic pet.