Sit in a circle. One person starts by walking over to someone and saying: "smile if you love me baby!" the recipient of this remark replies: "I love you baby but I just can't smile!" The person that approached them has to try and make them laugh/smile with funny faces, funny voice etc. but no physical contact. If the other person does smile, then they have effectively lost that little bit and it's their turn to say the "smile if you love me" bit to someone else. I they manage not to smile, then the origional person must try it on someone else until they manage to make someone smile!