Anyways, here's how it goes; in each post you grant the previous wish and make a wish of your own. Only you have to twist the granted wish so that it's funny. Here's an example;
Poster A: I wish that I had a puppy.
Poster B: Granted. Only someone wants it, too, so he ends up killing you to have it.
I wish that my girlfriend was hotter.
Poster C: Granted. Every time you touch her, you burn yourself. Serves you right for being greedy.
I wish I had pancakes right now.
..and so on. Make sure you both grant the previous wish and make a wish in your post. So, to start this off;
I wish that my sister was named "Boy."