Puffer fish chases after laser pointer video

Here is another funny video I saw on Stupid Videos today.  I have seen videos of dogs and cats chasing after laser pointers, but in this video, we see a fish chasing after it.  Pretty funny to watch.  Interestingly, the other fish in the tank seemed to be holding back while the big one is chasing after a laser pointer.  By the way, I do not have a fish tank in my house, but my brother Justin does (he has a beta fish).