We just got word of another potential pet coming in Cataclysm. This one was clearly inspired by Thing from The Adams Family. It's idle animation will have you playing "Rock, Paper, Scissors" until the your raid leader kicks you to the curb.
We have no idea how this pet might be obtained, but we'll let you know when we get more details.
I've got to "hand" it to Blizzard... this is one pet we'll all definitely want to get our "hands" on.