I was at work and a co-worker was telling us that she used to have one of those beta fish that always fight each other. The fish would see its reflection in the glass and then run into glass trying to fight with itself. Because of its dominant behavior, they decided to call it Master, which they ended up changing to Mastuh so that they would be able to say Mastuh Beta.
Of course, then I chime in saying that it's not like the fish had a choice, because she didn't put any females in there with it. It's not really that funny online (especially on the forums), but I had everyone dying of laughter in the way that I said it.