If you know me, you also know I am a huge aquarium hobbyist. I have several fresh water tanks at home (to the slight irritation of my girlfriend) and often spend several minutes now and then just staring in at the majesty of these artificial underwater worlds. I was absent-mindedly playing with my green laser pointer one day, and noticed that my fish (mostly danios and guppies) were quite interested in it! This stands in stark contrast to their normal impassivity. I was captivated by their response, and took a short video before I left Seattle for Edinburgh (where I am now - more on that later!). Anyway - enjoy my freshwater fish chasing a laser!