I got this idea from a thread on BZPower (now closed, unfortunately) so some of you may have played this before. For those who haven't here's how it works:
The point is to make the previous poster's wish come true... but in an ironic/funny/unusual way that is clearly NOT what is intended (but please try to avoid creepy monkey's-paw type scenarios, unless you can make it funny). For instance:
Poster 1: I wish I had a pie.
Poster 2: A clown hits you in the face with a pie.
...And after you "grant" the previous poster's wish, you make one of your own.
So I'll kick things off by wishing that I could go to the world of Spira.