Because I might as well procrastinate while tackling many work deadlines to find out about these things. This might turn out to be important info to know for later know...for the day that I stumble upon a magical genie lamp...
  1. Infinite wishes
    I think most people have heard of this one. You can never wish for more wishes. Three is all that a genie can grant to one master.
  2. Death
    You can't wish for someone else (or yourself) to be dead.
  3. Becoming a higher being
    Apparently you cannot wish to leave the confines of your own dimension and became a higher being (eg. a goddess or an angel).