I thought of another one - don't know if has already been mentioned...

If you have been included in critical information THOU SHALL NOT pass on information to a third person without the express permission of the IVF couple (particularly if it is someone outside the intimate circle of family and friends).

This causes stress to said IVF couple who have to run around making sure that their intimate circle of family and friends have been informed, when they may not necessarily have wanted to inform them.

(Grrr Dad - gosh I hope that this does not get mentioned at the baptism tomorrow).