Anything goes be creative. It goes like this: one person makes a wish and in the next post you ruin the wish for the person and you write your own wish. Dont be offended because this is just a game. These people probably do not mean any harm so just play along.
For example:
Person1: I wish for a hotdog.
Person2: The hotdog sausage meat is tainted and you die of sickness.
(In same post)
Person2: I wish for a million dollars.
Person3: They are counterfeit
And on and on.
Here goes.
I wish for a 100 inch flatscreen plasma.