Why should a monkey avoid a tiger?

I am a Tiger and my closest friend is a Monkey. After several years we can understand and predict what actions will upset one another, and I enjoy Monkey's playful attitude but too much can anger me. In fact, reading our own sign descriptions two years ago has helped us get along much more and have a more harmonious relationship. I often read that Tiger and Monkey should avoid each other, but I can never find explanations regarding that warning. I've always been curious and wanted more information about that topic.