They have been planning it since they were in the womb: the great Cry Conspiracy.
As soon as I am alone both my girls cry at once. It is executed especially well when I am nursing one of them. Just when I have sat down and got one comfortably eating, the other starts screaming.
Of course this never happens when someone else is here. Oh no, this is reserved for mom only.
They have a whole lifetime ahead of them for scheming. I will not let them win this battle. Oh no. I will overcome.