This is simple. (I don't know why I keep saying this, and then make it complicated. XD)

This is how it will go:
User A: I wish the person who replies next will... (insert wish here)
User B: Did it! (shows proof) I wish for the next person to... (insert wish here)

The wishes have to be something that we can do on Fanpop, since we can't see anyone outside of Fanpop. You don't have to do it for long unless you want to. You have to at least do it for 5 minutes though. Have fun! :)