I agree with the rubbing their tummy back, or if its someone that makes me feel really uncomfable they get a pretty stern look and I back away. I still don't understand why complete strangers think its acceptable to rub your belly, just because you're pregnant. We all do our best to avoid physical contact with strangers normally - there's no way in the world you would turn to the person standing in the line behind you at the bank, rub their tummy and comment on the weather now is there?? Same goes for people thinking its ok to touch your baby once they're born - another one that drives me nuts.