This is one I got from Memphis Steve.
Basically, one person makes a wish in the comments section. The next person to comment grants the wish, but gives it a negative outcome. Then they make their own wish, and the cycle completes itself.
For example. I wish I could get oral sex from Zac Effron. The next person can grant it but tells me that during oral sex I get over excited and snap his tiny neck between my gigantic thighs.
Ok. Maybe not that brutal, but you get the gist.
I'll go first. I wish that I didn't have to shave my legs.