Sherlock Holmes-What does Gypsy fortune-telling mean?

I think it may mean something, because in the west, many small things are preserved in myths and bibles, such as apples. It's probably easy to understand. I don't agree with Sherlock Holmes asking for fortune telling. I think it's just a detail inserted to highlight the theme of the film, not only the cleverness of Sherlock Holmes but also his dependence on Watson, so that Downey can create a very distinctive peanut image. This is a detail.