Hmmm... This is an interesting thing to do and I think there are a lot of myth attached to so many things, depending on people's tradition and beliefs. Hehe.
We don't really have a myth like this in my part of the world, but I'm glad I got to hear this story.
Myths are just myths, you can believe it or not. I just smile when I hear something like this myth, because I've never seen it, maybe I have but I forgot :D
Hahah... I think this particular myth is quite interesting. I will probably be thinking of it whenever I come across a banana tree.