A person tells three things in their post. Then the the person below them has to say which one is different from the other two. Or you can say the none of them have anything in common. You can also say that all of them have something in common. Then they say three more things. Simple, no?
I'll start.
1) A mouse
2) My face
3) A telephone
I'll start.
1) A mouse
2) My face
3) A telephone