Because something said something about a fish, which made me think of you, which made me think of that song, which led to to start humming it, which ended up in me humming that and loads of other classic Disney songs.
Well, it's such a common word..... But, then again, I think of people here from completely random words that aren't even their names. (Did you know that "ni" is a very, very common word in French? It basically means "not." Yeah. I get distracted in that class. >.>)